Hi, my MBP15" throws windows off screen...as though the trackpad gesture (4 fingers and thumb expand out) has been applied. It happens mainly when I mouse over to the top left of the screen when, for instance, minimising or closing windows/apps/browsers etc. I've played around with the trackpad in Preferences, taken it to a 'Genius' at the local Apple Store with no positive results. Has anyone else experienced this? I thought it may have something to do with the battery as I's read that they can sometimes expand and put pressure on the TP from beneath. Had this checked out and it's not that either. All suggestions much appreciated. Thanks in advance, Phil.