I tried using Mission Control with two monitors for the first time yesterday. Nothing fancy: a YouTube video in fullscreen (aka with its own Space) on the secondary screen, whatever else I was doing on the primary (built-in laptop) screen.

It was such a broken mess. Opening Mission Control and closing it again, interacting with it only on the primary screen, would often (but not always) result in the secondary screen forgetting what it was doing and going to a normal desktop space instead of the video space.

And I'm certain that windows are more prone to overlap now than they were before?

I also genuinely cannot believe how broken Mission Control is. I use it constantly and the flickering, black spaces, and other small issues lead to an overall frustrating experience I did not have in 26. I'm very surprised that these issues didn't come up on HN from all the beta users, many reporting that they're very happy with 27. Is Mission Control a feature that those likely to download the beta are disproportionately unlikely to use?

Pretty sure Apple must dedicate a product manager to coming up with new ways to break spaces in each OS release.

Spaces really needs some attention. It makes me much more productive overall, but it really feels like it's been forgotten. Beyond just making it less buggy, some simple things would make a huge difference, like being able to rename spaces, and not only showing the name of the space when you hover over it.

Edit: Thanks for the tip about killing the dock to get the keyboard shortcuts working. That was driving me mad. Do you have to do that every restart, or will those just work now?

I use Spaces very heavily and it is amazing how much they borked it up. Even 27.0.1 is not helping it.

Spaces have been nearly unusably bad for a very long time in MacOS. I used them heavily, but in frustration, have simply given up on them completely. They're simply too unreliable and inconsistent, even when they're at their best.

Also am I tripping or is anti-aliasing missing from the previews now? It looks like glitter when they’re moving and I swear it wasn’t like that before.

I had a fun one where clicks stopped registering sometimes and right clicks didn’t register sometimes and my mouse disappeared randomly.

I thought my machine was broken. Turns out this is a known bug with window managers (????????)

The sporadic nature of it had me question my own sanity.

I’ve experienced spaces shortcuts not working suddenly throughout the Tahoe release at least, so I doubt it’s specifically related to Golden Gate. They could have made it worse somehow of course.

They rewrote it this year and it doesn’t seem like they polished it enough :(

The bugs in Mission Control are a deal breaker for me. I use spaces extensively and they are almost unusable in macOS 27. It is inexplicable that they did not notice how badly they broke things.

Fortunately I only upgraded a single computer, immediately noticed the bugs, and noped out on the other computers.

Welp, sounds like another year running Sequoia for me.