I have a Magic Trackpad that seems to click and move on its own intermittently. Secondary click, click and drag, pointer moves, etc. I switched it out with a known good trackpad, and I still have the problem so I'm thinking it's an issue with my system. I have a MacPro running 10.6 with 8GB RAM. I have changed the trackpad batteries, unpaired and paired the trackpad, restarted, and installed all system updates. Any ideas?