I am encountering the same problem and it started about the same time. First I thought it was one of the recently installed mods, so I uninstalled them, but it did not change anything. Than again it worked for a short time etc. Sometimes it worked to load an old save-game (but not a new one), and then I could load the new ones, because when it once worked, it kept working (until I closed the game and tried again later/next day). I also tried to have Steam validate the game files, and everytime steam tells me one file need to be replaced, and does so (it does not tell which file, but it is 880 byte large). I have a fairly new computer, Win7 Home Premium, drivers and such up to date (as far as I can tell). edit: And NVSE. FNW with all DLC bought on Steam, and a couple of mods (Conelrad, Electro City, Lucky 38 Casino Marker, Mission Mojave, MTUI, New Vegas Bounties I & II, Project Nevada, New Bison Steve Hotel, Unlimited Companions, Willow and a few more), but as I said, before it all worked fine and I have no idea, what could have changed it. Thanks for helping in advance.