I've had that problems a few times. Once with United when I was in the 2010 season
Apparantly it can happen if you dont quit the game before you shut down the computer. Like say if you've saved the game and cant be bothered to press quit on it and wait for it to go off your screen, instead you just press the computer off button with the game still running, this is what happens.
I done that alot, and have since stopped doing it and mine has been working perfectly. Touch wood.