{"code":"var Component=(()=>{var p=Object.create;var a=Object.defineProperty;var g=Object.getOwnPropertyDescriptor;var u=Object.getOwnPropertyNames;var k=Object.getPrototypeOf,m=Object.prototype.hasOwnProperty;var y=(n,i)=>()=>(i||n((i={exports:{}}).exports,i),i.exports),f=(n,i)=>{for(var s in i)a(n,s,{get:i[s],enumerable:!0})},r=(n,i,s,o)=>{if(i&&typeof i==\"object\"||typeof i==\"function\")for(let t of u(i))!m.call(n,t)&&t!==s&&a(n,t,{get:()=>i[t],enumerable:!(o=g(i,t))||o.enumerable});return n};var w=(n,i,s)=>(s=n!=null?p(k(n)):{},r(i||!n||!n.__esModule?a(s,\"default\",{value:n,enumerable:!0}):s,n)),b=n=>r(a({},\"__esModule\",{value:!0}),n);var h=y((C,l)=>{l.exports=_jsx_runtime});var F={};f(F,{default:()=>c});var e=w(h());function d(n){let i={a:\"a\",code:\"code\",em:\"em\",h2:\"h2\",h3:\"h3\",img:\"img\",li:\"li\",ol:\"ol\",p:\"p\",pre:\"pre\",span:\"span\",strong:\"strong\",table:\"table\",tbody:\"tbody\",td:\"td\",th:\"th\",thead:\"thead\",tr:\"tr\",ul:\"ul\",...n.components};return(0,e.jsxs)(e.Fragment,{children:[(0,e.jsx)(i.p,{children:\"If you live in Mission Control \\u2014 several desktops, a couple of full-screen apps, maybe two or three displays \\u2014 macOS 27 Golden Gate may have made your Mac feel broken in a way no Mac has felt for years. Desktops dragged to another display leave a dead black rectangle behind. Swiping from a full-screen app to the next Space flashes and then goes nowhere. Thumbnails vanish from the Spaces bar, minimised windows disappear from App Expos\\xE9, and apps forget which desktop they were assigned to. Other people on the same release report none of it. This guide sorts the reported bugs into groups, gives the workarounds that actually help for each one, explains what the settings behind Spaces really do, and sets honest expectations about when a fix is likely \\u2014 because the first update for macOS 27 is not the one you might expect.\"}),`\n`,(0,e.jsx)(i.p,{children:(0,e.jsx)(i.img,{alt:\"A woman at a desk gesturing at her external monitor, where one desktop thumbnail in the Spaces row at the top has gone black\",src:\"/images/blog/macos-27-mission-control-spaces-broken-black-screen-fix-2026/hero.webp\",width:\"1200\",height:\"675\"})}),`\n`,(0,e.jsx)(i.h2,{id:\"key-takeaways\",children:\"Key Takeaways\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"The problems are real and widely reported, but not universal.\"}),\" A MacRumors thread started on 16 September documents jerky animations, blank desktops after leaving full screen, missing thumbnails and minimised windows, and apps losing their desktop assignments. Other users on the same macOS 27.0 release, including one on a Mac Studio M4 Max, report none of it.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"The black-screen bug has a reliable workaround.\"}),\" When dragging a desktop to another display leaves an unresponsive black screen, create a new desktop on that display, switch to it, then delete it.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Restart, then restart the Dock.\"}),\" Mission Control runs inside the Dock process. A restart fixed missing thumbnails for at least one user; \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),\" clears many transient glitches without logging out.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Two settings change how Spaces behave more than any other.\"}),' \"Automatically rearrange Spaces based on most recent use\" and \"Displays have separate Spaces\". Turning the first off stops desktops from reshuffling; changing the second needs a log-out and changes everything.']}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Do not expect 27.1 to fix it.\"}),\" Apple skipped a public 27.1 beta and went straight to 27.2 beta 1 on 16 September. Forum members report that 27.2 beta 1 did not fix the Mission Control problems.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Resetting Spaces is the last resort, not the first.\"}),\" Deleting \",(0,e.jsx)(i.code,{children:\"com.apple.spaces\"}),\" wipes every desktop layout and app assignment. Back the file up first.\"]}),`\n`]}),`\n`,(0,e.jsx)(i.h2,{id:\"what-people-are-actually-reporting\",children:\"What People Are Actually Reporting\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"It helps to be precise about which bug you have, because the workarounds differ. We have grouped the reports from the \",(0,e.jsx)(i.a,{href:\"https://forums.macrumors.com/threads/mission-control-totally-broken-on-macos-27.2489622/\",children:'MacRumors \"Mission Control totally broken on macOS 27\" thread'}),\", \",(0,e.jsx)(i.a,{href:\"https://www.techradar.com/computing/mac-os/never-have-i-experienced-such-a-windows-esque-bug-in-macos-mission-control-is-a-mess-in-macos-27-golden-gate-and-users-are-questioning-apples-testing\",children:\"TechRadar's round-up of 21 September\"}),\", and individual write-ups such as \",(0,e.jsx)(i.a,{href:\"https://bados.life/2026/09/18/macos-27-golden-gate-mission-control-bugs/\",children:\"BaDos Life's first-week report\"}),\". All of these are user reports rather than Apple-confirmed issues; Apple has not published a known-issue entry for them.\"]}),`\n`,(0,e.jsxs)(i.table,{children:[(0,e.jsx)(i.thead,{children:(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.th,{children:\"Symptom\"}),(0,e.jsx)(i.th,{children:\"Where it was reported\"}),(0,e.jsx)(i.th,{children:\"Workaround exists?\"})]})}),(0,e.jsxs)(i.tbody,{children:[(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"Dragging a desktop to another display leaves an unresponsive black screen\"}),(0,e.jsx)(i.td,{children:\"TechRadar (quoting a user)\"}),(0,e.jsx)(i.td,{children:\"Yes \\u2014 create, switch to, then delete a new desktop\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"Switching from a full-screen app to an adjacent Space blanks the desktop\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread, TechRadar\"}),(0,e.jsx)(i.td,{children:\"Partial \\u2014 avoid full screen, restart the Dock\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"Switching to another full-screen app flashes but does not switch\"}),(0,e.jsx)(i.td,{children:\"BaDos Life\"}),(0,e.jsx)(i.td,{children:\"Partial \\u2014 use the Dock or Command-Tab instead of swipes\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:'Window dragging in Mission Control at around 25 frames per second; animations \"both too slow and too fast\"'}),(0,e.jsx)(i.td,{children:\"MacRumors thread\"}),(0,e.jsx)(i.td,{children:\"Partial \\u2014 Reduce Motion\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"No thumbnails of desktops in the Spaces bar\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread\"}),(0,e.jsx)(i.td,{children:\"Often \\u2014 restart\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"Minimised windows missing from Mission Control and App Expos\\xE9\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread; earlier reports against the release candidate\"}),(0,e.jsx)(i.td,{children:\"Partial \\u2014 restore via Command-Tab\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"Apps no longer stay assigned to a desktop\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread\"}),(0,e.jsx)(i.td,{children:\"Not yet\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"A Safari tab torn off into a new window appears offset, behaves like a modal and disappears\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread\"}),(0,e.jsx)(i.td,{children:\"Not yet\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"The Dock does not always appear in full-screen mode\"}),(0,e.jsx)(i.td,{children:\"BaDos Life\"}),(0,e.jsx)(i.td,{children:\"Partial \\u2014 move the pointer to the display edge again, restart the Dock\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"One to two seconds of lag when clicking any menu bar item\"}),(0,e.jsx)(i.td,{children:\"MacRumors thread (M1 Ultra, and on a clean install)\"}),(0,e.jsx)(i.td,{children:\"Not yet\"})]})]})]}),`\n`,(0,e.jsxs)(i.p,{children:[\"Two details from the thread deserve emphasis. The original poster noted that much of the rest of the system feels smoother than before, which suggests these problems are specific to window and Space management rather than general slowness. And the lag reports come from people who say they are past the post-upgrade indexing period and have tried restarts and even a clean install, so do not dismiss them as Spotlight rebuilding in the background \\u2014 although that does cause temporary sluggishness, as we explain in our guide to \",(0,e.jsx)(i.a,{href:\"/blog/macos-27-spotlight-reindexing-battery-drain-stuck-how-to-fix-2026\",children:\"Spotlight reindexing after macOS 27\"}),\".\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"what-apple-did-fix-before-release\",children:\"What Apple did fix before release\"}),`\n`,(0,e.jsx)(i.p,{children:\"Apple's own macOS 27 release notes do not list any open Mission Control issues, but they do list two fixed ones that tell you this area was being worked on during the beta:\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsx)(i.li,{children:'\"Fixed: While using an app in full screen, the Dock might persist when entering and exiting Mission Control.\" (174992242)'}),`\n`,(0,e.jsx)(i.li,{children:'\"Fixed: When you exit a window from fullscreen mode using Mission Control, the window might be lost.\" (177660206)'}),`\n`]}),`\n`,(0,e.jsxs)(i.p,{children:[\"If you are seeing either of these on 27.0, it is worth filing feedback, because Apple considers them resolved. Our \",(0,e.jsx)(i.a,{href:\"/blog/macos-27-golden-gate-release-day-update-guide-september-14-2026\",children:\"release-day guide\"}),\" also recorded two reports against the release candidate that match what people are still seeing on 27.0: App Expos\\xE9 no longer showing minimised windows, and Mission Control renumbering Spaces per display.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"why-some-macs-are-fine\",children:\"Why some Macs are fine\"}),`\n`,(0,e.jsx)(i.p,{children:\"The variation is the most confusing part. A user on a Mac Studio M4 Max reports none of these problems; others on an M1 Ultra and an M5 Pro report most of them. We have not been able to reproduce the bugs ourselves \\u2014 our main test Mac is still on macOS Tahoe 26.5.2 \\u2014 so we cannot say which factor decides it. The reports have some things in common, though: heavy use of full-screen apps, more than one display, and many desktops. If your setup is simple, you may never see these bugs; if it is complex, the workarounds below matter more.\"}),`\n`,(0,e.jsx)(i.h2,{id:\"how-mission-control-and-spaces-actually-work\",children:\"How Mission Control and Spaces Actually Work\"}),`\n`,(0,e.jsx)(i.p,{children:\"Knowing where the moving parts are makes the fixes less mysterious.\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Mission Control runs inside the Dock.\"}),' There is no separate \"Mission Control\" process to quit. The Dock process draws Mission Control, manages Spaces, handles full-screen transitions and owns hot corners. When you run ',(0,e.jsx)(i.code,{children:\"killall Dock\"}),\", the Dock restarts within a second or two, and Mission Control's state is rebuilt from preferences. Open windows and apps are not affected.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Your Spaces layout lives in a preferences file.\"}),\" The arrangement of desktops per display is stored in \",(0,e.jsx)(i.code,{children:\"~/Library/Preferences/com.apple.spaces.plist\"}),\". You can read it without changing anything:\"]}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsx)(i.code,{children:(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" com.apple.spaces\"})]})})})}),`\n`,(0,e.jsxs)(i.p,{children:[\"On our test Mac this shows a \",(0,e.jsx)(i.code,{children:\"SpacesDisplayConfiguration\"}),\" dictionary with one entry per display the Mac has ever used with separate Spaces. The built-in display is listed as \",(0,e.jsx)(i.code,{children:\"Main\"}),\"; external displays are identified by a UUID. Displays that are not currently connected still appear, with a \",(0,e.jsx)(i.code,{children:\"Collapsed Space\"}),\" entry instead of a list of Spaces. That is why macOS can put your desktops back where they were when you reconnect a monitor \\u2014 and it is also why a corrupted entry for one display can confuse Mission Control on another.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Mission Control's behaviour is controlled by a few keys.\"}),\" Two are worth knowing:\"]}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsxs)(i.code,{children:[(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" com.apple.dock\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" mru-spaces\"})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" com.apple.spaces\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" spans-displays\"})]})]})})}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.code,{children:\"mru-spaces\"}),' is the \"Automatically rearrange Spaces based on most recent use\" setting; ',(0,e.jsx)(i.code,{children:\"1\"}),\" means it is on. \",(0,e.jsx)(i.code,{children:\"spans-displays\"}),' is the inverse of \"Displays have separate Spaces\": ',(0,e.jsx)(i.code,{children:\"0\"}),\" means each display has its own Spaces (the default), \",(0,e.jsx)(i.code,{children:\"1\"}),\" means Spaces span all displays. On our Mac these read \",(0,e.jsx)(i.code,{children:\"1\"}),\" and \",(0,e.jsx)(i.code,{children:\"0\"}),\" \\u2014 the defaults.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Full-screen apps are Spaces too.\"}),\" Every full-screen window gets its own Space next to your desktops. Moving from a full-screen app to a desktop is a Space switch, which is why the full-screen and Spaces bugs tend to appear together.\"]}),`\n`,(0,e.jsx)(i.h2,{id:\"record-your-setup-before-you-change-anything\",children:\"Record Your Setup Before You Change Anything\"}),`\n`,(0,e.jsx)(i.p,{children:\"Troubleshooting Mission Control goes wrong most often because people change several settings at once and then cannot tell which one helped \\u2014 or cannot get back to where they started. Spend two minutes recording your current state first. Every command below only reads; nothing is changed.\"}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsxs)(i.code,{children:[(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\"echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Auto-rearrange Spaces (mru-spaces):     $('}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read com.apple.dock mru-spaces \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"2>\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\"/dev/null \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"||\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:` 'not set (default: on)')\"`})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\"echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Spaces span displays (spans-displays):  $('}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read com.apple.spaces spans-displays \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"2>\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\"/dev/null \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"||\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:` 'not set (default: 0, separate Spaces)')\"`})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\"echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Group windows by app (expose-group-apps): $('}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read com.apple.dock expose-group-apps \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"2>\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\"/dev/null \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"||\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:` 'not set (default: off)')\"`})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\"echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Switch to Space with app windows:       $('}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read NSGlobalDomain AppleSpacesSwitchOnActivate \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"2>\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\"/dev/null \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"||\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:` 'not set (default: on)')\"`})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\"echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Stage Manager (GloballyEnabled):        $('}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" read com.apple.WindowManager GloballyEnabled \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"2>\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\"/dev/null \"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\"||\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" echo\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:` 'not set')\"`})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"system_profiler\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" SPDisplaysDataType\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#D73A49\",\"--shiki-dark\":\"#F97583\"},children:\" |\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\" grep\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" -E\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:' \"Display Type|Resolution|Main Display|Connection Type\"'})]})]})})}),`\n`,(0,e.jsx)(i.p,{children:\"A few notes on reading the output, based on what these commands printed on our Tahoe test Mac:\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:'\"Not set\" is normal.'}),\" macOS only writes most of these keys once you change the setting from its default. On our Mac, \",(0,e.jsx)(i.code,{children:\"expose-group-apps\"}),\" and \",(0,e.jsx)(i.code,{children:\"AppleSpacesSwitchOnActivate\"}),\" did not exist at all, while \",(0,e.jsx)(i.code,{children:\"mru-spaces\"}),\" read \",(0,e.jsx)(i.code,{children:\"1\"}),\" and \",(0,e.jsx)(i.code,{children:\"spans-displays\"}),\" read \",(0,e.jsx)(i.code,{children:\"0\"}),\" \\u2014 the defaults written out explicitly.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsxs)(i.strong,{children:[\"Stage Manager should normally read \",(0,e.jsx)(i.code,{children:\"0\"}),\".\"]}),\" If it reads \",(0,e.jsx)(i.code,{children:\"1\"}),\", Stage Manager is on, and window behaviour you are attributing to Mission Control may be Stage Manager's. That was \",(0,e.jsx)(i.code,{children:\"0\"}),\" on our Mac.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"The display section is what Apple will want.\"}),` It lists each display's type, resolution, connection and which one is main. Our single built-in display printed \"Built-in Liquid Retina XDR Display\", \"3024 x 1964 Retina\", \"Main Display: Yes\" and \"Connection Type: Internal\".`]}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:\"Save the output in a note. If you later reset Spaces or change a setting, you have a record of how things were, and if you file a bug with Apple, you can paste it straight into the report.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"narrow-down-the-trigger\",children:\"Narrow down the trigger\"}),`\n`,(0,e.jsx)(i.p,{children:\"With the baseline recorded, spend a few minutes finding the smallest set of actions that reproduces your bug. Try, in this order:\"}),`\n`,(0,e.jsxs)(i.ol,{children:[`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"One display, no full-screen apps.\"}),\" Disconnect external displays, exit all full-screen apps, and use Mission Control normally with two or three desktops.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Add full-screen apps.\"}),\" Put one app into full screen and switch between it and a desktop several times.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Add the second display.\"}),\" Reconnect it and repeat both tests.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Add your utilities.\"}),\" If everything so far was fine with utilities quit, start them one at a time.\"]}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:'Most people find that the problems appear at a specific step. That tells you which of the fixes below to focus on, and it turns a vague \"Mission Control is broken\" into a report Apple engineers can reproduce.'}),`\n`,(0,e.jsx)(i.h2,{id:\"fixes-in-the-order-to-try-them\",children:\"Fixes, in the Order to Try Them\"}),`\n`,(0,e.jsx)(i.p,{children:\"Work down the list. Each step is safe; only the last two change your layout in a way you will notice.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"1-restart-the-mac-once\",children:\"1. Restart the Mac once\"}),`\n`,(0,e.jsx)(i.p,{children:\"It sounds too simple, but one user in the MacRumors thread with missing desktop thumbnails on an M1 Ultra reported that a restart fixed it. After a major upgrade, a restart also lets background tasks settle. Do it once, then give the Mac a day before deciding the problem is persistent.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"2-restart-the-dock-when-mission-control-misbehaves\",children:\"2. Restart the Dock when Mission Control misbehaves\"}),`\n`,(0,e.jsx)(i.p,{children:\"When animations stutter, the Spaces bar is blank, or the Dock refuses to appear in a full-screen app, restart the Dock:\"}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsx)(i.code,{children:(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"killall\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" Dock\"})]})})})}),`\n`,(0,e.jsxs)(i.p,{children:[\"Mission Control, hot corners and the Dock reload immediately. You lose nothing except any Mission Control view that was open. \",(0,e.jsx)(i.a,{href:\"https://macnews.info/blog/mission-control-broken-macos-27-fix/\",children:\"macnews.info's fix guide\"}),\" lists restarting the Dock as a confirmed fix for temporary glitches, and it is the quickest thing to try each time a glitch appears.\"]}),`\n`,(0,e.jsxs)(i.p,{children:['If you find yourself doing this several times a day, add it as a shortcut. In the Shortcuts app, create a shortcut with a single \"Run Shell Script\" action containing ',(0,e.jsx)(i.code,{children:\"killall Dock\"}),\", and give it a keyboard shortcut.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"3-rescue-a-black-screen-left-by-a-moved-desktop\",children:\"3. Rescue a black screen left by a moved desktop\"}),`\n`,(0,e.jsx)(i.p,{children:\"This is the most distinctive macOS 27 bug. You drag a desktop from the Spaces bar on one display to another, and the display you took it from is left showing a black, unresponsive screen. The workaround, described by a user quoted by TechRadar, is:\"}),`\n`,(0,e.jsxs)(i.ol,{children:[`\n`,(0,e.jsx)(i.li,{children:\"Open Mission Control on the display that went black (move the pointer there and press Control-Up Arrow, or swipe up with three or four fingers).\"}),`\n`,(0,e.jsxs)(i.li,{children:[\"Click the \",(0,e.jsx)(i.strong,{children:\"+\"}),\" button at the right end of the Spaces bar on that display to create a new desktop.\"]}),`\n`,(0,e.jsx)(i.li,{children:\"Click the new desktop to switch to it. The black screen is replaced by a working desktop.\"}),`\n`,(0,e.jsxs)(i.li,{children:[\"Open Mission Control again, hover over the new desktop's thumbnail and click the \",(0,e.jsx)(i.strong,{children:\"\\xD7\"}),\" to delete it \\u2014 or keep it if you want an extra desktop.\"]}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:\"Until Apple fixes this, the simplest prevention is not to drag whole desktops between displays. Move individual windows instead: drag the window's title bar to the other display, or use the Window menu's Move & Resize commands.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"4-turn-off-automatic-rearranging-of-spaces\",children:\"4. Turn off automatic rearranging of Spaces\"}),`\n`,(0,e.jsxs)(i.p,{children:['If your desktops keep reshuffling, apps appear on the \"wrong\" desktop, or keyboard shortcuts such as Control-1 and Control-2 take you to unexpected places, turn off automatic rearrangement. In System Settings > Desktop & Dock, scroll to the Mission Control section and turn off ',(0,e.jsx)(i.strong,{children:\"Automatically rearrange Spaces based on most recent use\"}),\". The Terminal equivalent is:\"]}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsxs)(i.code,{children:[(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" write\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" com.apple.dock\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" mru-spaces\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" -bool\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#005CC5\",\"--shiki-dark\":\"#79B8FF\"},children:\" false\"})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"killall\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" Dock\"})]})]})})}),`\n`,(0,e.jsx)(i.p,{children:\"The macnews.info guide lists this as a confirmed fix for desktop shuffling. It does not fix the black screen or the animation problems, but it removes one source of apparent randomness, which makes it much easier to see which of the remaining bugs you actually have.\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"While you are in that section, note the other options: \",(0,e.jsx)(i.strong,{children:\"When switching to an application, switch to a Space with open windows for the application\"}),\", \",(0,e.jsx)(i.strong,{children:\"Group windows by application\"}),\", and \",(0,e.jsx)(i.strong,{children:\"Displays have separate Spaces\"}),\". Change one at a time, so you know which change made a difference.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"5-avoid-full-screen-while-this-is-broken\",children:\"5. Avoid full screen while this is broken\"}),`\n`,(0,e.jsx)(i.p,{children:\"Most of the worst reports involve full-screen apps: blank desktops when leaving one, switches that flash and go nowhere, a Dock that will not appear. Full screen is optional. You get nearly the same working area by filling the window instead:\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsxs)(i.li,{children:[\"Choose \",(0,e.jsx)(i.strong,{children:\"Window > Move & Resize\"}),\" and pick \",(0,e.jsx)(i.strong,{children:\"Fill\"}),\" (or use the green button's menu, which offers the same tiling options).\"]}),`\n`,(0,e.jsx)(i.li,{children:`Double-click the window's title bar. What that does is set in Desktop & Dock under \"Double-click a window's title bar to\", where Fill is one of the choices.`}),`\n`,(0,e.jsx)(i.li,{children:\"Hide the Dock and menu bar automatically in Desktop & Dock and Control Center settings if you want the extra pixels.\"}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:\"Apple's release notes add a small related change: in macOS 27, the Window > Move & Resize and Window > Full Screen Tile menus can also be used to move, resize, open and save panels that are not displayed as a sheet (150791154). A filled window does not create a new Space, so it sidesteps the Space-switching bugs entirely.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"6-get-minimised-windows-back\",children:\"6. Get minimised windows back\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"If minimised windows no longer appear in Mission Control or App Expos\\xE9, you can still restore them. The macnews.info guide reports this workaround as working for users: press \",(0,e.jsx)(i.strong,{children:\"Command-Tab\"}),\", keep Command held while you move to the app, then press and hold \",(0,e.jsx)(i.strong,{children:\"Option\"}),\" before releasing Command. The app's minimised window is restored. You can also click the app's icon in the Dock and choose the window from the Window menu, or right-click the Dock icon to see its windows.\"]}),`\n`,(0,e.jsx)(i.p,{children:\"To stop the problem from getting in your way, consider not minimising at all while this bug persists. Hiding the app (Command-H) keeps its windows out of the way and makes them easy to bring back with Command-Tab.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"7-reduce-animation-problems-with-reduce-motion\",children:\"7. Reduce animation problems with Reduce Motion\"}),`\n`,(0,e.jsxs)(i.p,{children:['For the \"judder\" and the animations that are \"both too slow and too fast\", turning on ',(0,e.jsx)(i.strong,{children:\"Reduce motion\"}),\" in System Settings > Accessibility > Display replaces the sliding Space transitions with a cross-fade. It does not fix the underlying bug, and we have not been able to measure its effect on macOS 27 ourselves, but it removes the most visible part of it for many people and costs nothing to try. If you have also turned transparency down with the new Liquid Glass slider, you have already reduced some of the compositor's work; we explain that connection in our \",(0,e.jsx)(i.a,{href:\"/blog/windowserver-high-cpu-macos-tahoe-26-5-liquid-glass-multi-display-fix-2026\",children:\"WindowServer high CPU guide\"}),\".\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"8-rule-out-utilities-that-hook-into-window-management\",children:\"8. Rule out utilities that hook into window management\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"Mission Control bugs are exactly the kind of problem that third-party utilities can either cause or amplify. Mouse remappers, window managers and trackpad-gesture tools all hook into the same events. The macnews.info guide notes that the developer of \",(0,e.jsx)(i.strong,{children:\"Mac Mouse Fix\"}),\" has fixed a macOS 27 problem in its source code and published a temporary build; other tools may need updates too.\"]}),`\n`,(0,e.jsx)(i.p,{children:\"A quick test tells you whether a utility is involved:\"}),`\n`,(0,e.jsxs)(i.ol,{children:[`\n`,(0,e.jsx)(i.li,{children:\"Open Mission Control three ways: a trackpad swipe, Control-Up Arrow on the keyboard, and whatever custom method you normally use (a mouse button, a hot corner, a utility's shortcut).\"}),`\n`,(0,e.jsx)(i.li,{children:\"If the trackpad and keyboard work but your custom method does not, the problem is the utility, not macOS.\"}),`\n`,(0,e.jsx)(i.li,{children:\"For a broader check, quit every menu-bar utility and log out and back in, or start up in safe mode, and see whether the bugs persist.\"}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:\"If a utility is responsible, check its website or issue tracker for a macOS 27 update before reporting the bug to Apple.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"9-check-app-assignments-to-desktops\",children:\"9. Check app assignments to desktops\"}),`\n`,(0,e.jsx)(i.p,{children:\"Several people report that apps no longer stay on the desktop they are assigned to \\u2014 apps open on the current Space, and when checked later, show no assignment. There is no fix yet, but check the setting is actually applied:\"}),`\n`,(0,e.jsxs)(i.ol,{children:[`\n`,(0,e.jsx)(i.li,{children:\"Right-click the app's Dock icon.\"}),`\n`,(0,e.jsxs)(i.li,{children:[\"Choose \",(0,e.jsx)(i.strong,{children:\"Options\"}),\".\"]}),`\n`,(0,e.jsxs)(i.li,{children:[\"Under \",(0,e.jsx)(i.strong,{children:\"Assign To\"}),\", choose \",(0,e.jsx)(i.strong,{children:\"This Desktop\"}),\" (or \",(0,e.jsx)(i.strong,{children:\"All Desktops\"}),\" if you want the app everywhere).\"]}),`\n`]}),`\n`,(0,e.jsxs)(i.p,{children:[\"If the assignment reverts, you have hit the reported bug. As a workaround, \",(0,e.jsx)(i.strong,{children:\"All Desktops\"}),\" is less affected in principle because it does not depend on a specific Space identifier \\u2014 but we have not been able to confirm that on macOS 27, so treat it as something to try rather than a known fix.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"10-change-displays-have-separate-spaces-log-out-required\",children:'10. Change \"Displays have separate Spaces\" (log-out required)'}),`\n`,(0,e.jsxs)(i.p,{children:[\"This setting has the largest effect of any, and it requires you to log out for the change to take effect. With it \",(0,e.jsx)(i.strong,{children:\"on\"}),\" (the default), each display has its own set of desktops and full-screen apps, and the menu bar appears on every display. With it \",(0,e.jsx)(i.strong,{children:\"off\"}),\", your desktops span all displays together.\"]}),`\n`,(0,e.jsx)(i.p,{children:'Turning it off is worth trying if your problems are all multi-display: dragging desktops between displays, black screens on a secondary display, full-screen apps on the \"wrong\" monitor. It changes how you work, so treat it as a temporary workaround. You will find it at the bottom of the Mission Control section in Desktop & Dock settings.'}),`\n`,(0,e.jsx)(i.h3,{id:\"11-reset-your-spaces-configuration-last-resort\",children:\"11. Reset your Spaces configuration (last resort)\"}),`\n`,(0,e.jsx)(i.p,{children:\"If Mission Control is consistently wrong on one display, or the Spaces bar shows desktops that should not exist, the stored configuration may be the problem. Resetting it deletes every desktop layout and every per-display arrangement; afterwards you start with one desktop per display and must recreate the rest. App assignments to desktops are also lost.\"}),`\n`,(0,e.jsx)(i.p,{children:\"Back up first, then reset:\"}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsxs)(i.code,{children:[(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"cp\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" ~/Library/Preferences/com.apple.spaces.plist\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" ~/Desktop/com.apple.spaces.plist.backup\"})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"defaults\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" delete\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" com.apple.spaces\"})]}),`\n`,(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"killall\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" Dock\"})]})]})})}),`\n`,(0,e.jsx)(i.p,{children:\"The macnews.info guide lists this as the reset step. If it makes things worse, copy the backup back into place and log out immediately:\"}),`\n`,(0,e.jsx)(e.Fragment,{children:(0,e.jsx)(i.pre,{className:\"shiki shiki-themes github-light github-dark\",style:{\"--shiki-light\":\"#24292e\",\"--shiki-dark\":\"#e1e4e8\",\"--shiki-light-bg\":\"#fff\",\"--shiki-dark-bg\":\"#24292e\"},tabIndex:\"0\",icon:'<svg viewBox=\"0 0 24 24\"><path d=\"m 4,4 a 1,1 0 0 0 -0.7070312,0.2929687 1,1 0 0 0 0,1.4140625 L 8.5859375,11 3.2929688,16.292969 a 1,1 0 0 0 0,1.414062 1,1 0 0 0 1.4140624,0 l 5.9999998,-6 a 1.0001,1.0001 0 0 0 0,-1.414062 L 4.7070312,4.2929687 A 1,1 0 0 0 4,4 Z m 8,14 a 1,1 0 0 0 -1,1 1,1 0 0 0 1,1 h 8 a 1,1 0 0 0 1,-1 1,1 0 0 0 -1,-1 z\" fill=\"currentColor\" /></svg>',children:(0,e.jsx)(i.code,{children:(0,e.jsxs)(i.span,{className:\"line\",children:[(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#6F42C1\",\"--shiki-dark\":\"#B392F0\"},children:\"cp\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" ~/Desktop/com.apple.spaces.plist.backup\"}),(0,e.jsx)(i.span,{style:{\"--shiki-light\":\"#032F62\",\"--shiki-dark\":\"#9ECBFF\"},children:\" ~/Library/Preferences/com.apple.spaces.plist\"})]})})})}),`\n`,(0,e.jsx)(i.p,{children:\"Then log out and back in. Preferences are cached by the system, which is why copying the file alone is not enough; logging out makes macOS reload it.\"}),`\n`,(0,e.jsx)(i.h2,{id:\"when-will-apple-fix-it\",children:\"When Will Apple Fix It?\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"This is where macOS 27 differs from recent years. Apple did \",(0,e.jsx)(i.strong,{children:\"not\"}),\" release a public beta of 27.1. Instead, \",(0,e.jsx)(i.a,{href:\"https://www.macrumors.com/2026/09/16/apple-releases-macos-27-2-beta-1/\",children:\"MacRumors reported\"}),\" that Apple seeded the first developer beta of \",(0,e.jsx)(i.strong,{children:\"macOS 27.2\"}),\" on 16 September, just two days after 27.0 shipped, and \",(0,e.jsx)(i.a,{href:\"https://9to5mac.com/2026/09/22/apple-releases-macos-27-2-golden-gate-public-beta-1/\",children:\"9to5Mac reported\"}),\" the first 27.2 public beta on 22 September. The widely reported explanation is that iOS 27.1 is tied to a new iPhone launching in October, so the other platforms moved straight to 27.2 for beta testing.\"]}),`\n`,(0,e.jsx)(i.p,{children:`For Mission Control users, the forum reports are not encouraging. One member wrote on 17 September that \"27.2 beta 1 didn't fix any glitches\", and the thread's original poster, after testing it, confirmed \"No change, still broken in 27.2\" before going back to Tahoe. By 23 September, participants were discussing a second 27.2 beta without anyone yet reporting a fix. Apple may still ship a smaller 27.0.x update with targeted fixes \\u2014 it often does \\u2014 but nothing has been announced.`}),`\n`,(0,e.jsx)(i.p,{children:\"The practical expectation, then, is that a proper fix may take weeks rather than days. Plan around the workarounds above.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"report-it-properly\",children:\"Report it properly\"}),`\n`,(0,e.jsx)(i.p,{children:\"Apple prioritises bugs partly by the volume and quality of reports. If Mission Control is broken for you, file it in Feedback Assistant, and include:\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsx)(i.li,{children:\"A screen recording of the bug happening.\"}),`\n`,(0,e.jsx)(i.li,{children:\"Your display setup (how many displays, which is main, how they are connected).\"}),`\n`,(0,e.jsx)(i.li,{children:\"The state of the four Mission Control settings in Desktop & Dock.\"}),`\n`,(0,e.jsxs)(i.li,{children:[\"A sysdiagnose captured right after the bug occurs (press Shift-Control-Option-Command-Period; the file appears in \",(0,e.jsx)(i.code,{children:\"/private/var/tmp\"}),\" after a few minutes).\"]}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:\"A report with a recording and a sysdiagnose is worth far more than a comment in a forum thread.\"}),`\n`,(0,e.jsx)(i.h2,{id:\"should-you-go-back-to-tahoe\",children:\"Should You Go Back to Tahoe?\"}),`\n`,(0,e.jsx)(i.p,{children:\"Several people in the MacRumors thread did exactly that, including the thread's original poster, who went back to 26.7. Others are staying on Sequoia or Tahoe until 27.2 ships. The decision depends on how central Mission Control is to your work:\"}),`\n`,(0,e.jsxs)(i.table,{children:[(0,e.jsx)(i.thead,{children:(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.th,{children:\"Your situation\"}),(0,e.jsx)(i.th,{children:\"Recommendation\"})]})}),(0,e.jsxs)(i.tbody,{children:[(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"You rarely use full-screen apps or multiple desktops\"}),(0,e.jsx)(i.td,{children:\"Stay on 27.0; you may never see these bugs.\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"You use several desktops on one display\"}),(0,e.jsx)(i.td,{children:\"Try steps 1\\u20137. Most people in this group can work around the problems.\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"You use full-screen apps across two or more displays every day\"}),(0,e.jsx)(i.td,{children:\"Try steps 1\\u201310. If the black-screen or blank-desktop bugs hit you repeatedly, consider going back to Tahoe until a fix ships.\"})]}),(0,e.jsxs)(i.tr,{children:[(0,e.jsx)(i.td,{children:\"You have not upgraded yet and rely on Mission Control\"}),(0,e.jsx)(i.td,{children:\"Wait. Nothing is lost by staying on Tahoe 26.7, which received its security update the same day 27.0 shipped.\"})]})]})]}),`\n`,(0,e.jsxs)(i.p,{children:[\"Going back is not trivial. There is no downgrade button: you need to erase the Mac, install a version of Tahoe Apple still signs, and restore your data from a backup made \",(0,e.jsx)(i.strong,{children:\"before\"}),\" the upgrade. A Time Machine backup made on macOS 27 cannot simply be restored onto Tahoe as a whole system. Our guide to \",(0,e.jsx)(i.a,{href:\"/blog/downgrade-macos-27-beta-to-tahoe-without-losing-data-guide-2026\",children:\"downgrading from macOS 27 to Tahoe without losing data\"}),\" walks through the process, and it applies to the release version as well as the betas.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[\"If you decide to stay, consider a different window-management style while you wait. Stage Manager uses a separate mechanism for grouping windows and is unaffected by most of the Spaces problems reported so far; our \",(0,e.jsx)(i.a,{href:\"/blog/macos-tahoe-stage-manager-complete-guide-2025\",children:\"Stage Manager guide\"}),\" covers how it works. It is not for everyone, but for some people it is a better temporary answer than going back a whole OS version.\"]}),`\n`,(0,e.jsx)(i.p,{children:(0,e.jsx)(i.img,{alt:\"A man leaning back in his chair holding an external backup drive and weighing whether to go back to the previous macOS version\",src:\"/images/blog/macos-27-mission-control-spaces-broken-black-screen-fix-2026/content-1.webp\",width:\"1200\",height:\"800\"})}),`\n`,(0,e.jsx)(i.h2,{id:\"a-checklist-for-multi-display-setups\",children:\"A Checklist for Multi-Display Setups\"}),`\n`,(0,e.jsx)(i.p,{children:\"Multiple displays make every one of these bugs more likely. If that is your setup, a few habits help while macOS 27 is in this state:\"}),`\n`,(0,e.jsxs)(i.ul,{children:[`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Keep the main display stable.\"}),\" Changing which display holds the menu bar (in Displays settings, by dragging the white bar in the arrangement view) reorganises Spaces. Avoid doing it until Mission Control is fixed.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Connect displays in the same order.\"}),\" Spaces are remembered per display identifier. Docks and adapters that present displays in a different order after sleep can confuse that mapping.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Close full-screen apps before disconnecting a display.\"}),\" Full-screen Spaces on a display that disappears have to be moved somewhere; that transition is exactly where the blank-screen bugs appear.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Prefer filled windows over full screen on secondary displays.\"}),\" They survive disconnection and do not create Spaces.\"]}),`\n`,(0,e.jsxs)(i.li,{children:[(0,e.jsx)(i.strong,{children:\"Restart the Dock after reconnecting.\"}),\" If Mission Control looks wrong after waking from sleep or reconnecting a display, \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),\" is quicker than troubleshooting.\"]}),`\n`]}),`\n`,(0,e.jsx)(i.p,{children:(0,e.jsx)(i.img,{alt:\"Top-down view of a tidy multi-display desk, with a hand plugging a cable into a USB-C dock next to a closed laptop and an external monitor\",src:\"/images/blog/macos-27-mission-control-spaces-broken-black-screen-fix-2026/content-2.webp\",width:\"1200\",height:\"800\"})}),`\n`,(0,e.jsx)(i.h2,{id:\"troubleshooting-common-issues\",children:\"Troubleshooting Common Issues\"}),`\n`,(0,e.jsx)(i.h3,{id:\"mission-control-opens-but-shows-no-windows-at-all\",children:\"Mission Control opens but shows no windows at all\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": Mission Control opens to an empty desktop, or windows appear briefly and vanish.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": Run \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),\". If that does not help, check whether Group windows by application is on and try turning it off. Then check whether the missing windows are minimised \\u2014 minimised windows are one of the reported blind spots \\u2014 and restore them with Command-Tab and Option as described above.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"keyboard-shortcuts-for-desktops-do-nothing\",children:\"Keyboard shortcuts for desktops do nothing\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": Control-Left Arrow, Control-Right Arrow or Control-number shortcuts no longer switch desktops.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": Open System Settings > Keyboard > Keyboard Shortcuts > Mission Control and make sure the shortcuts are enabled. Control-number shortcuts only appear once the corresponding desktops exist, so create the desktops first. If they are enabled and still do nothing, restart the Dock.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"the-spaces-bar-shows-extra-desktops-i-did-not-create\",children:\"The Spaces bar shows extra desktops I did not create\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": Additional desktops appear, often after connecting or disconnecting a display.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": When a display disconnects, macOS moves its desktops onto the remaining display so windows are not lost. Remove the extras with their \\xD7 button in Mission Control. If they return every time, the stored configuration for that display may be damaged; reset Spaces as in step 11, after backing up.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"full-screen-video-goes-black-when-i-switch-away-and-back\",children:\"Full-screen video goes black when I switch away and back\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": A full-screen video player shows a black window after switching Spaces.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": Exit full screen with Escape or Control-Command-F and re-enter it. If it happens repeatedly, play the video in a filled window instead. Apple's release notes list a fixed bug where the Music visualizer showed a black screen in both full-screen and window mode (177480780), so if it happens in Music specifically, report it.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"my-hot-corners-stopped-working\",children:\"My hot corners stopped working\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": Hot corners for Mission Control or Desktop no longer trigger.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": Check the assignments in System Settings > Desktop & Dock > Hot Corners. Hot corners are handled by the Dock, so \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),\" often restores them. If a window-management utility also claims screen corners, disable it and test again.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"menus-in-the-menu-bar-take-a-second-or-two-to-open\",children:\"Menus in the menu bar take a second or two to open\"}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Problem\"}),\": Every menu bar click has a noticeable delay.\"]}),`\n`,(0,e.jsxs)(i.p,{children:[(0,e.jsx)(i.strong,{children:\"Solution\"}),\": First rule out the post-upgrade workload: if Spotlight is still indexing, the lag should disappear within a few days. Users who report the lag persisting after a week and even after a clean install have not found a workaround; report it with a sysdiagnose taken right after reproducing it.\"]}),`\n`,(0,e.jsx)(i.h2,{id:\"faq\",children:\"FAQ\"}),`\n`,(0,e.jsx)(i.h3,{id:\"is-mission-control-broken-for-everyone-on-macos-27\",children:\"Is Mission Control broken for everyone on macOS 27?\"}),`\n`,(0,e.jsx)(i.p,{children:\"No. Many users report serious problems, especially with full-screen apps and multiple displays, but others on the same release report none. The variation has not been explained, and Apple has not acknowledged the issue publicly.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"how-do-i-fix-the-black-screen-after-moving-a-desktop-to-another-display\",children:\"How do I fix the black screen after moving a desktop to another display?\"}),`\n`,(0,e.jsx)(i.p,{children:\"On the display that went black, open Mission Control, click + to add a new desktop, switch to it, then delete it. The black screen is replaced by a working desktop. Avoid dragging whole desktops between displays until Apple fixes the bug.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"does-macos-272-beta-fix-mission-control\",children:\"Does macOS 27.2 beta fix Mission Control?\"}),`\n`,(0,e.jsx)(i.p,{children:\"Not according to users who tested it. Forum members reported that 27.2 beta 1, released on 16 September, did not fix the glitches. Apple skipped a public 27.1 beta, so a full fix may take some weeks.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"is-it-safe-to-delete-comapplespacesplist\",children:\"Is it safe to delete com.apple.spaces.plist?\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"It is safe in that macOS recreates it, but you lose every desktop layout and app assignment. Copy it to your Desktop first, then run \",(0,e.jsx)(i.code,{children:\"defaults delete com.apple.spaces\"}),\" and \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),\". Log out after restoring the backup if you need to go back.\"]}),`\n`,(0,e.jsx)(i.h3,{id:\"does-killall-dock-close-my-apps\",children:\"Does killall Dock close my apps?\"}),`\n`,(0,e.jsx)(i.p,{children:\"No. It restarts the Dock process, which also runs Mission Control, hot corners and Spaces. Open apps and windows stay where they are. You will see the Dock disappear and reappear within a second or two.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"should-i-downgrade-to-macos-tahoe-because-of-mission-control\",children:\"Should I downgrade to macOS Tahoe because of Mission Control?\"}),`\n`,(0,e.jsx)(i.p,{children:\"Only if the bugs block your daily work and the workarounds do not help. Downgrading means erasing the Mac and restoring from a backup made before the upgrade. Most people with simpler setups can work around the problems until a fix ships.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"what-does-displays-have-separate-spaces-actually-change\",children:'What does \"Displays have separate Spaces\" actually change?'}),`\n`,(0,e.jsx)(i.p,{children:\"With it on, each display has its own desktops and full-screen apps, and every display shows a menu bar. With it off, one set of desktops stretches across all displays, so switching desktops switches every screen at once. Changing it requires logging out, and it is worth trying when your bugs only occur with more than one display.\"}),`\n`,(0,e.jsx)(i.h3,{id:\"does-stage-manager-have-the-same-bugs\",children:\"Does Stage Manager have the same bugs?\"}),`\n`,(0,e.jsx)(i.p,{children:\"The reports so far concern Mission Control, Spaces and full-screen apps. Stage Manager uses a different mechanism for grouping windows, so it is a reasonable temporary alternative, though we have not tested it on macOS 27 ourselves.\"}),`\n`,(0,e.jsx)(i.h2,{id:\"conclusion\",children:\"Conclusion\"}),`\n`,(0,e.jsxs)(i.p,{children:[\"Mission Control in macOS 27 is in a worse state than any recent release, but it is not uniformly broken, and most of the problems have at least a partial workaround. Restart once, then use \",(0,e.jsx)(i.code,{children:\"killall Dock\"}),` whenever a glitch appears. Use the create-switch-delete trick for black screens, turn off automatic rearranging, and lean on filled windows rather than full-screen apps. Keep the heavy fixes \\u2014 changing \"Displays have separate Spaces\" or resetting your Spaces file \\u2014 for when the lighter ones fail. And report what you see with a recording and a sysdiagnose, because with Apple's first update now in the 27.2 cycle, clear reports are the best way to make sure these bugs are at the top of the list.`]}),`\n`,(0,e.jsx)(i.p,{children:(0,e.jsxs)(i.em,{children:[\"Related reading: \",(0,e.jsx)(i.a,{href:\"/blog/macos-27-golden-gate-release-day-update-guide-september-14-2026\",children:\"macOS 27 Golden Gate release-day guide\"}),\" \\xB7 \",(0,e.jsx)(i.a,{href:\"/blog/windowserver-high-cpu-macos-tahoe-26-5-liquid-glass-multi-display-fix-2026\",children:\"WindowServer high CPU with Liquid Glass and multiple displays\"}),\" \\xB7 \",(0,e.jsx)(i.a,{href:\"/blog/downgrade-macos-27-beta-to-tahoe-without-losing-data-guide-2026\",children:\"Downgrade from macOS 27 to Tahoe without losing data\"})]})})]})}function c(n={}){let{wrapper:i}=n.components||{};return i?(0,e.jsx)(i,{...n,children:(0,e.jsx)(d,{...n})}):d(n)}return b(F);})();\n;return Component;","toc":[{"title":"Key Takeaways","url":"#key-takeaways","depth":2},{"title":"What People Are Actually Reporting","url":"#what-people-are-actually-reporting","depth":2},{"title":"What Apple did fix before release","url":"#what-apple-did-fix-before-release","depth":3},{"title":"Why some Macs are fine","url":"#why-some-macs-are-fine","depth":3},{"title":"How Mission Control and Spaces Actually Work","url":"#how-mission-control-and-spaces-actually-work","depth":2},{"title":"Record Your Setup Before You Change Anything","url":"#record-your-setup-before-you-change-anything","depth":2},{"title":"Narrow down the trigger","url":"#narrow-down-the-trigger","depth":3},{"title":"Fixes, in the Order to Try Them","url":"#fixes-in-the-order-to-try-them","depth":2},{"title":"1. Restart the Mac once","url":"#1-restart-the-mac-once","depth":3},{"title":"2. Restart the Dock when Mission Control misbehaves","url":"#2-restart-the-dock-when-mission-control-misbehaves","depth":3},{"title":"3. Rescue a black screen left by a moved desktop","url":"#3-rescue-a-black-screen-left-by-a-moved-desktop","depth":3},{"title":"4. Turn off automatic rearranging of Spaces","url":"#4-turn-off-automatic-rearranging-of-spaces","depth":3},{"title":"5. Avoid full screen while this is broken","url":"#5-avoid-full-screen-while-this-is-broken","depth":3},{"title":"6. Get minimised windows back","url":"#6-get-minimised-windows-back","depth":3},{"title":"7. Reduce animation problems with Reduce Motion","url":"#7-reduce-animation-problems-with-reduce-motion","depth":3},{"title":"8. Rule out utilities that hook into window management","url":"#8-rule-out-utilities-that-hook-into-window-management","depth":3},{"title":"9. Check app assignments to desktops","url":"#9-check-app-assignments-to-desktops","depth":3},{"title":"10. Change \"Displays have separate Spaces\" (log-out required)","url":"#10-change-displays-have-separate-spaces-log-out-required","depth":3},{"title":"11. Reset your Spaces configuration (last resort)","url":"#11-reset-your-spaces-configuration-last-resort","depth":3},{"title":"When Will Apple Fix It?","url":"#when-will-apple-fix-it","depth":2},{"title":"Report it properly","url":"#report-it-properly","depth":3},{"title":"Should You Go Back to Tahoe?","url":"#should-you-go-back-to-tahoe","depth":2},{"title":"A Checklist for Multi-Display Setups","url":"#a-checklist-for-multi-display-setups","depth":2},{"title":"Troubleshooting Common Issues","url":"#troubleshooting-common-issues","depth":2},{"title":"Mission Control opens but shows no windows at all","url":"#mission-control-opens-but-shows-no-windows-at-all","depth":3},{"title":"Keyboard shortcuts for desktops do nothing","url":"#keyboard-shortcuts-for-desktops-do-nothing","depth":3},{"title":"The Spaces bar shows extra desktops I did not create","url":"#the-spaces-bar-shows-extra-desktops-i-did-not-create","depth":3},{"title":"Full-screen video goes black when I switch away and back","url":"#full-screen-video-goes-black-when-i-switch-away-and-back","depth":3},{"title":"My hot corners stopped working","url":"#my-hot-corners-stopped-working","depth":3},{"title":"Menus in the menu bar take a second or two to open","url":"#menus-in-the-menu-bar-take-a-second-or-two-to-open","depth":3},{"title":"FAQ","url":"#faq","depth":2},{"title":"Is Mission Control broken for everyone on macOS 27?","url":"#is-mission-control-broken-for-everyone-on-macos-27","depth":3},{"title":"How do I fix the black screen after moving a desktop to another display?","url":"#how-do-i-fix-the-black-screen-after-moving-a-desktop-to-another-display","depth":3},{"title":"Does macOS 27.2 beta fix Mission Control?","url":"#does-macos-272-beta-fix-mission-control","depth":3},{"title":"Is it safe to delete com.apple.spaces.plist?","url":"#is-it-safe-to-delete-comapplespacesplist","depth":3},{"title":"Does killall Dock close my apps?","url":"#does-killall-dock-close-my-apps","depth":3},{"title":"Should I downgrade to macOS Tahoe because of Mission Control?","url":"#should-i-downgrade-to-macos-tahoe-because-of-mission-control","depth":3},{"title":"What does \"Displays have separate Spaces\" actually change?","url":"#what-does-displays-have-separate-spaces-actually-change","depth":3},{"title":"Does Stage Manager have the same bugs?","url":"#does-stage-manager-have-the-same-bugs","depth":3},{"title":"Conclusion","url":"#conclusion","depth":2}],"estimatedTime":26}