I have done countless hours of research and tinkering of files trying to get FONV to work since the latest patch that supposedly "fixed" issues (haha...riiight) anywho. I noticed that for whatever reason this time around, the game does not like it when you edit the .ini files (the mouse accel fix still works though). I realized that it was Darn's UI that was breaking the game, (the editing of the font section of the .ini file) So sadly I had to not use his mod...which kills me, I love his UI's so much. I just took that out of the equation and the game runs just fine. Maybe some other people that are having this issue as well will be able to get their game to run now.
Hope this helps some.
~Eric