Windows Key "stuck"

Periodically, the RDP 6.0 client seems to think that the Windows key is being pressed (outside of the RDP, it is not; rebooting the host doesn't fix).  At least one other person has experienced this: MS Terminal Services blog.  As noted there, pressing the Windows key a few times fixes it for a while.  Anyone know of a real solution or if this is known by MS?

Thanks