The sidebar from the right side, the one with the Start button, settings, search, etc... is no longer responding to input... tapping on the icons does nothing. same goes for closing apps by sliding in from the top. actually, all the sliding functionality for that matter is not working. this only seems to happen when the keyboard is attached (the keyboard with clicky keys). when i detach the keyboard, everything starts responding as it should. i've tried power-cycling everything, but no change in the behavior.