Ive had a quick search but can't seem to find a solution. with both of the most recent builds (68 & 69) the game runs @ 1024x768, regardless of what i configure too?? I normally run @ 1920x1080 through a projector. Also, i had a quick run in the GT mod & half the car was missing? cheers, Nik..
That is the default res, something is messed up with your system or installation... I'd personally uninstall and reinstall (default paths).