[rudedog]

1st remove the spearhead demo.
Then if your seeing graphic problems!
Remove all your custom PK3 files.

create a folder called "back up" or whatever you wish to name it

move all your custom PK 3 files to this folder. you should only have the default 0-6 pk3 files left, including any other game files.

Now install your game or restart your game. If all works now, add your PK3 files back one at a time until you experience the problem. So far the 3 people I talked to. That had problems this fixed it ASAP

Good luck and enjoy this exp rocks!