Why do multi-finger gestures on my trackpad sometimes stop working on Mavericks?
Since upgrading my 2011 iMac to OS X Mavericks, I've had numerous bugs, especially related to my trackpad.
Sometimes it will freeze up and stop moving, and I have to turn it off and back on. Other times the multi-finger gestures don't work at all, and if I try to do the two-finger "back" gesture in Safari, the browser freezes up.
iMac, OS X Mavericks (10.9)