The story:
I have a freshly installed FO3 and FNV with TTW, with lots of mods of coz, all works fine (as a side note, it seems the whole game got more stable after TTW....)
Recently, I installed that 8 NV uncut, and the game starts with FNV opening, then FO3 opening, and you woke upat Dr Mitchell's house........ I unclicked all those new mods but still have the problemm.
Then, I use thermador's "start in DC or NV" mod http://taleoftwowastelands.com/content/start-nv-or-dc , if I choose start in DC, problem solved!!
The problem is "fixed", but but still, just wonder what has gone wrong........