Hey guys.
I re-installed FNV to start a new, clean game with the new release of TTW. Downloaded and installed it as usual, and I encountered the no main menu bug.
Following the instructions here I narrowed the problem down to the PointLookout_main.BSA. Tried re-building with the TTW installer, no good.
So while continuing with the rather complicated fix instructions I decided to experiment by simply copying the PointLookout_main.BSA from my FO3 data folder and pasting directly into my FNV data folder and this appears to have worked. Menu now shows up and I could travel to point lookout, characters and creatures are all there, everything seems fine.
So will this work? or will this cause problems?