When I wake my MacBook Pro (mid 2012 - with Mountain Lion) from sleep, sometimes some complicated gesture doesn't work anymore with the Trackpad or Magic Mouse.
Changing screens (with 4 fingers with trackpad or with 2 fingers with the mouse), getting Mission Control with 4 fingers, dragging windows with 3 fingers: they all don't work.
Clicks, taps, two fingers gestures still work though.
I have tried to change the configuration of the trackpad but it doesn't work.
Changing screen with Ctrl + Left Arrow or Right Arrow still work too.
What can I do to restart these features without restarting the computer (when I restart of course it works again like a charm)?