Alright here's the problem, everytime I'm not connected to xbox live and go to load up a save it says that some downloaded content is corrupted and couldn't be loaded, now I've got Honest Hearts too (haven't got Old World Blues yet) but its not affected. Someone else suggested I that I uninstall the classic pack that I had and that would fix the problem but it didn't, so does anybody have any suggestions as to what I can do to fix this? It's really annoying to lose perks that I've taken from DM and have no way to replace them.

You could clear your hardrive cache, then reload the patches for NV. That is all I can think of, some download was corupted and it is messing with the game.