Is it actually SWITCHING screens or just highlightling the bottom bar icon? The 'Windows' key (to left of 'ALT') does that with 'TAB' if it sticks.
As 'AVCP' says, if the 'ALT' key is sticking, you will get the 'choose application' box on screen when you press 'TAB'.
OTH, if the 'WINDOWS' key is sticking, you should get the 'QUICK RUN' panel on the left of the screen???
Try cleaning the toast out of the keyboard and see.
