Great game, but...

I bought the car pack, and for the life of me will not work, I restart the game and try to buy it again, says I already bought it and if I would like it again for free, I hit yes and put in my info, payment successful, then stuck on the car pack screen and cannot go back. Restart the game and says I dont have the pack again. Same thing over and over again. Please fix this bug!

Necro2fox about Carmageddon, v1.6