i've got a MacBook Pro mid 2012 with Mountain Lion. Sometimes when i wake up my computer from sleep (open the laptop), all the multi touch gestures of the trackpad (4 fingers to change screen, 3 finger to move windows) don't work anymore. Tap to click, Two finger navigation still work
I don't understand why but it's not everytime so maybe i could just reload the driver or make it work again. Is there a way to restart the trackpad service or should i really restart the computer completely to make it work again (it works but i don't want to restart it)
EDIT : i have a Magic Mouse and the gesture of the Magic Mouse to change screen doesn't work anymore either. So it's maybe more a general problem than Trackpad. Switching screen with Ctrl+Arrows works though.