Turns out it wasn't the config file after all. I had to delete all my bot skins from the base3q folder and that seemed to sort it out. One dodgy bot messed the whole thing up. Anyway, thanks for help guys I appreciate it.

Hi, Whenever I download and install point release 1.32 then try and play quake all I see when i'm gaming are large black squares which come come out of the explosions. These squares take up the entire screen and I can't see what I'm doing. Text in the top corner reads "Nul poly shading". I...