Have you been able to solve your SHIFT-KEY-STUCK-DOWN problem. I have the same problem. I'm using a Lattitude D820 and I've tried everything I can think of. I know is a software issue (not peanut butter or a paper stuck on shift key) since I am using a docking station and both the keyboard to the docking station and the laptop keyboard act the same. I have even tried the On-Screen keyboard and it also behaves stuck. Only re-booting puts me back to normal.