I bought a WM8650 off eBay, and it generally works fine except for the accelerometer. The tablet came pre-rooted with the official Android Market. Rotating the tablet does work correctly, the display will auto-rotate. Games that use the accelerometer don't work though. The object in the game that is controlled by the accelerometer will go completely to the left side when starting the game. Rotating the tablet 360 degrees will cause the object to move a bit, but not in a way that's usable. I've tried multiple games and they all show the same behavior. Any ideas?