Three finger swipe disappears upon waking from sleep. How do I get it back?

I'm running Mountain Lion (10.8.1) and when my 17 inch MBP wakes from sleep, the three finger swipe between full screen pages is gone. Also, Mission Control is inoperative. Any ideas as to what's causing this and how I get the functions back short of rebooting?

Yes, it is selected. I found another similar thread that suggested 'killall Dock' as a way to get the gesture back. That seems to work. I now have the gesture and Mission Control back working. I know how to fix the problem the next time it shows up.
Hopefully it will be addressed in a future update of Mountain Lion.

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