My mouse had this problem after I got my new computer a while back, where it would get stuck on the screen, not stop working but act funny, getting stuck on part of the screen unable to move to the bottom half by an invisible barrier. I thought it was the mouse, so some time later, I got a new mouse. For a while I didn't see the problem happen. But then it did, does anyone have any idea what this could be? I've had several hard drive wipes during this time, so there's no way it's software.