I just ran into the A-bomb and used OAF to fix it. I've done this before with past games and everything went fine.

The problem I'm having now is that I'm running and launching my game through OBSE due to several mods such as the map overhaul and the keychain. Well, the OAF wouldn't recognize my game saves which were OBSE, so when I ran the fix I can no longer launch through OBSE without the game going to a dark screen when I try to fast travel and I can't use any of the features OBSE provides. My keychain is inaccessable and Map Marker Overhaul doesn't work.

Help?

IIRC Wrye Bash also has an animation fixer.

As Kivan ,said, use Wrye Bash's animation fixer, which can be found in the saves tab, by right clicking on save, and choosing "Repair ABomb".

Yeah, use WryeBash like the others said. But also, I looked into that keychain mod a while back, assuming its the same one, you shouldn't be using it, as it causes crashes with the patched game. If I recall, DarnUI has its own keychain feature. (I'm using DarnUIDark or whatever it's called and it has it.)