This problem started up yesterday out of the blue. What happens is that I sometimes cannot control the trackpad yet I can still use my wireless mouse. I have since disabled all unnecessary trackpad functions (multitouch etc.) and it has seemed to help. The strangest thing that it did last night was when it appeared to be erratically moving across my desktop creating new folders. Also, the most recent development is that the bottom third or so of my trackpad has ceased to respond to my touch. This trackpad seems to have a mind of its own! Please advise. This is the Summer 2009 MBP. Thanks