I had to do an update for steam, and afterward I did this all my vegas save games will not properly start. When the load screen has finished, the visuals are the same but constantly flashing (cue: epilepsy) but the game is active! I know this because the rest of the sounds still occur (real-time jump noises etc). If anyone knows a fix for this (or if you know you literally have to start all over) then please let me know.
Thankies from V.A.T.S