Invisible Dock gap/snap appearing since MacOs 27

Started happening when I updated to 27.0.0 and still happening in 27.0.1.

It is very random. I have no idea what triggers it. Sometimes after using the system normally for hours.

An invisible block appears at the bottom of the screen and all windows clash against it when resizing, unless you drag them (but then resizing teleports them back up). It's not just Chrome as in the example shown in the video, it happens with all windows from all applications.

It also stops randomly and goes back to normal. I haven't found a way to reverse it on purpose other than restarting.

I haven't been able to find info online.

It really seems to be Dock-related, since the gap is exactly the same height as the Dock itself.

The Dock itself is still visible and fully functional on hover (not shown in the video).

Posted on Oct 3, 2026 5:43 PM

4 replies

neuroanatomist

Level 9 (72,871 points)

Oct 3, 2026 8:58 PM in response to maroov

That is odd, indeed. The invisible barrier appears to be 'taller' than the Dock, to me.

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.

markmats

Level 1 (8 points)

Oct 26, 2026 11:27 PM in response to maroov

This exact issue happens to me and it's so annoying.

thewalruss

Level 1 (12 points)

Nov 10, 2026 1:17 AM in response to maroov

Same for me. It's super annoying. Worst macOS update ever.