Sitting here messing around on my i7 iMac, and my new trackpad isn't playing nice. Basically, right now (this instant), it is totally nonresponsive. If I go into the trackpad setup, and go to the "bluetooth setup" screen, the pointer immediately becomes responsive and works - I just hit the back button, continues to work. It then seems to function fine as long as I don't push it to do anything more than two finger scrolling. The minute I ask it do do a three or four finger expose maneuver, it goes dead. Zooming seems fine - just appears that 3 or 4 fingers locks it up!