Uwaaa sounds like someone messed up >.< I had a similar issue with Supersonic Acrobatic Rocketpowered Battlecars I think (yeah I know the title... xD) and I might be stating the obvious but have you tried to delete all traces of Episode 3 and then redownloading it from the store? For some reason the PS3 seems to be very bad with account certifications that change on the fly soo once you start off fresh it usually gets the right permissions^^