Mountain Lion - Mission Control doesn't work after wake up out of sleep mode. How to solve that?

I just installed Mountain Lion on a MacBook Pro 15" mid 2011 machine. I found that when coming out of sleep mode that Trackpad Gestures and Mission Control were not working. I also noticed that when coming out of sleep mode that the screen saver was still on in the background for just a moment (or more likely frozen). I shut off my screen saver and now both Gestures and Mission Control are working when coming out of sleep mode. This is not a solution just another work around. Hopefully Apple address this when the first Mountain Lion software update. I miss my screen saver! 😟

FYI: I was restarting my machine to make everything work but oddly enough my Desktop Image was not persisting. My Mac would reload the default 10.8 Desktop after restart. I think the Trackpad and Mission Control problem is somehow related to the Desktop and Screen Saver settings.

I have the same issue too. Now I know from all previous post that it is due to the wake up after machine slept or from screen saver. But I think Apple should tell us a work around or solution ASAP. It doesn't looks like it is only a specific bug for some config but it happen in all environments so it should be spot out during beta test.

I am having the same issues on my imac upgraded to mountain lion hope apple fix this ASAP!

😠

Same issue on my iMac after mountain lion install. Four finger gesture to start Mission Control doesn't work and clicking on the icon in the dock also doesn't work. Must restart to get it to work again.

How do we report this to apple so they can start working on the fix as i rely heavly on spaces and mission control. For multi tasking.

Did you try to restart mission control ?

http://osxdaily.com/2011/11/23/restart-mission-control-in-os-x-lion/

That fixed it for me.

Thanks benpeke really appricate your help

I can also confirm I'm having the same issue. Running a Mid 2009 MacBook Pro on 10.8.

Mission Control will quit working after prolonged use. However, opening terminal and running the command line "killall Dock" will get mission control back up and running. Hopefully Apple will have a fix for this issue.

Hi,

I have been experiencing the same problems with Mission Control since upgrading to Mountain Lion, and I might have a simpler temporary workaround than a killall dock terminal command. Not sure if this is going to work for all of you, but at least it worked for me.

I simply moved my mouse the the hot corner that manually starts the screen saver. After waking up my system from screensaver mode, Mission Control appears to be working just fine again.

However, I seem to have read, here or somewhere else, that the hot corners do not even work for other people, in which case this workaround may not do the trick for you.

Hopefully though this helps a few of you until Apple fixes the bug.

Hi. Same for me. I hope Apple guys save us with a nice software update, because i'm going nutts.

Did you try killing the dock yet?

Same problem here!

Same problem for me on a mid-2007 iMac with magic mouse. Killing the dock with teh activity monitor fixes the problem temporarily, but it often comes back after going to sleep again. Tried repairing disk permissions - no help. Hoping for a fix soon.

I did a restart - power button pressed until sound, and command option p r (about 5 times), and it has fixed the problem on my imac and macbook... The mouse icon is still slow, but it goes to normal after 15 seconds on both macbook and imac...

Thanks Zavs - the hot corner / screensaver solution worked for me.

Not ideal, but simpler than the KillAll solution (I think).

Just need Apple to release a fix