Hey — My Magic Trackpad had performed flawlessly for the three years I have used it, until about a week ago. Now the cursor changes the insertion point randomly in Mail, Safari, and other applications, it jumps off a Safari page onto the desktop. It closes windows. It even closes panes in Accordance. It selects a block of desktop randomly (like you would for a ⇧⌘4 screen shot). Hitting esc doesn't fix it. I've done all the usual things: repaired permissions, run TechTool Pro (no issues). Rebooting helps for a while. My husband even took the back off it to check for loose screws. I purchased the trackpad in 2010 while I had my MBP and am now using it with a MBA. I only use it when the laptop is connected to an external monitor, but that is a daily occurrence.
I paired the trackpad with my MacMini and saw the same behavior, but not immediately. I then paired it with my husband's iMac. Same result. (The quickest way to find out if there's a problem is to play Snood - after just a little while the cannon starts firing even when you aren't touching the trackpad.) There are reports on the Apple forums but no definitive solutions. Some have joked about demon-possession. Anyone on the forums know how to do a long-distance exorcism?
We're suspecting Mavericks. My husband is having the same problem with his Logitech RF mouse. So it's not just bluetooth issue. Both of us have had the problem just recently (my husband for about a week longer).
All the while the built-in trackpad of the MBA works perfectly. A Magic Mouse works perfectly (paired with either my Mac mini or MBA). The bluetooth keyboard I use with the MBA also works w/o a hitch.
Has anyone else experienced this? Any ideas? If I can't find a solution pretty soon, I'm going to see if reinstalling Mavericks helps. I think this is a hardware + OS issue. I use a lot of gestures on my trackpad. I really don't want to go back to a mouse. I've also found that the trackpad is easier on my hands — no wrist issues since I started using a trackpad almost exclusively.