I'm having the exact same problem. Going to give it another shot though because the post apoclyptic environment looks awesome. But the movement has thrown me off as well.
New Vegas is better than 3. Just sayin. It's not a mod either. It's a different game, and an improvement imo.
You guys talking about Fallout or one of the new fallouts like Fallout 3 and New Vegas?
Fallout 2 (get it on steam if you are interested) is the best of the series IMO. Best story, best characters, crazy stuff. Combat and graphics are dated, but if you can get used to them, such a great game.
The thread traceback was talking about 3. VATS wasn't an issue in 1&2 and we'd be seeing a whole different set of complaints in that case, I imagine...
Everybody good, plenty of slaves for my robot colony?