Every now and then my trackpad either freezes and disappears after clicking on a dialog in Desktop Mode, or jumps to the lower-left corner of the screen. In the former's case, it seems hitting the Windows key twice to jump in and out of the Start screen fixes it immediately, making me think it's a software issue and not a hardware one. Has anyone else had these problems? I have StartIsBack installed which I believe does some system-level hacking to do things like block hot corners, so maybe it's that. Still, I don't remember having as many problems with the Touch Cover I recently replaced.