I am having a problem with real racing. Every time I finish a race it says "files corupted or missing" so I tried to re-install it and still doesn't work (I bought the game unlike some pirates).
Have you tried contacting Firemint support directly...? http://getsatisfaction.com/firemint Hope that helps...
Good thinking sending the receipt with it, or else I am pretty sure they would write it off as pirating.