Check your fixed exe files (run the single player game and check the version number at the bottom menu page). If you got the fixed exe from GCW, then it's just the old 1.2 fixed exe packaged as as the 1.3. Deviance messed up? This could be the cause of some errors compatiblity errors among files of different versions. Hopefully it's updated soon.
http://fileforums.com/showthread.php?t=77132