Hate to resurrect this thread, but I have the same issue now. I've been playing my game just fine over the past week, and now suddenly I no longer am able to exit to Main Menu, nor am I able to travel neighborhoods (move to university or move to other neighborhood). What's strange is that I have not downloaded anything new nor have I updated or upgraded anything on my PC before facing these crashes now just a few days ago. Happens on all save files, new save file, etc.
I also tried disabling UAC like OP did to no avail, and also attempted running TS3 without CC from either the Packages folder and unticking the installed custom content in the launcher, still crashing.
