I have had the 4-finger gestures stop working randomly after some reboots recently. It has only happened twice, and it doesn't happen after every reboot. The only way I could find to fix it is reboot again. Playing with the trackpad settings doesn't fix it, and 4-finger gestures still show up as enabled. All the other multitouch gestures work just fine. Anyone know what could cause this, or how I can prevent it from happening? I have repaired permissions and it doesn't seem to help. I have a MBP4,1 running 10.6.2 with 6gb of RAM.