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Robert Kolk
User level: Level 1 (54 points)

Mission Control - 2nd screen issues - MacOS 27.0.1

I have two screens connected to my Mac mini M4 and had this issue with 27.0.0 and still have it with 27.0.1.


On my 2nd screen (the non-main display screen) after the system goes to sleep or locks (or both) the Desktops on that screen get all jumbled. App windows that were on Desktop 1 are now on 3, ones on 5 are now on 1, etc. And it's always random as to where to content moves when it happens.


Also after sleep I lose the keyboard shortcuts I've setup to switch between the Desktops. I have to "killall -KILL Dock" to get the shortcuts working again.


I also struggle to get the app windows back in place. They will spontaneously disappear as I'm dragging them to the new Desktop.


All of this only happens on the 2nd screen - Mission Control on the main display functions properly.

Posted on Oct 1, 2026 5:57 AM

1 reply

neuroanatomist
User level: Level 9 (72,871 points)

Oct 1, 2026 6:01 AM in response to Robert Kolk

There have been many issues reported with Mission Control and Spaces on macOS 27 Golden Gate, especially regarding the way Full Screen apps and app switching are handled. Some have been resolved by identifying and removing incompatible 3rd party extensions, others are bona fide bugs. The minor point update, macOS 27.0.1, did not appear to address the more significant issues.


Bugs should be reported to Apple here:

Feedback - macOS - Apple

 

See if the problem is present when you boot in safe mode. That process performs some system cleanup and clears caches, and also disables 3rd party extensions that may cause problems.

 

Start up your Mac in safe mode - Apple Support

 

If that does not correct the issue, test in a new user account. A newly-created user account will have all settings at default, and if the issue does not occur in that new account then it provides guidance on what may need to be changed to correct the issue.

 

Add a user or group on Mac - Apple Support

 

Once the testing is complete, the new account can easily be deleted.

 

Delete a user or group on Mac – Apple Support

 

Those steps will help to isolate the problem.

 

It might help to download and run EtreCheck, written by a long-time forum member. The free version is fine. Post the full report using the Additional Text button. No personal information is revealed. 



If the issue persists in safe mode and a new user account, that suggests that it's a bug that Apple needs to address.

 

Reporting issues like this to Apple is the only way to get them fixed. They do prioritize bugs based on frequency of reports, so the more people who report it, the faster it will be addressed.

 

Personally, Mission Control is working fine for my use cases on my 16" M4 Pro MBP running 27.0.1. I have many Spaces and open windows, but I don't use full screen apps and I don't have my apps grouped, both of which are associated with reported issues. I only very rarely use two displays, typically at my desk one Mac is in clamshell mode with a 5K:2K external display and the other Mac is open using only the internal display.

Originally posted at discussions.apple.com/thread/256368450