Multi-touch gestures not working
Downloaded ML yesterday and everything was peachy - all old gestures, plus Notification Centre. I left the gesture settings on default. Then I left the computer to clean the house, and when I came back hours later I woke the computer up from sleep.
The touchpad responds to the old two-finger gestures (scrolling up and down, swiping between Safari pages, pinch to zoom) plus the new Safari pinch in to flip between tabs. But any other gesture using three or four fingers (moving windows, accessing Launchpad or Mission Control), plus the new Notification Centre two-fingered off-pad swipe, does not work.
Rebooted the computer. Worked for ten minutes. Left it alone. Woke it up after sleep. Stopped working. Rinse and repeat twice before I realized there were issues. I also tried resetting the touchpad gestures (deactivating them, reactivating them, changing them to different gestures), but nothing has worked.
Has anyone else experienced this problem? Any suggestions? I would be grateful for any advice at all, because quite frankly, it bums me out. A lot.
Thanks!
MacBook Pro (13-inch Early 2011), OS X Mountain Lion