Furthermore, I also have 3 ED-Es floating around, who seem to be bugged. It doesn't matter if they are my companions while attacking the Legates Camp, or if I dismiss him before the final cut. I always end up with 3 of them. Additionally, Canibal Johnson will follow me around everywhere, and cannot be dismissed, too. The Transportalponder doesn't work either no more (I've played all the DLC in one row before playing the endgame) and killing Canibal Johnson does not make it all work again, too.
I've got FNV with all addons and preorder packs installed.
W7U64
ATI5770
PhenomIIx2-550BE
16GB-DDR3-1333
Soundblaster Audigy Platinum