EDIT: This problem was somehow fixed! I have no idea how I did it but it works now.

I can't or spectate any MP matches! It started when I changed Delta Squad's skins. I remembered to make a backup of CloneTextures.utx. I tried MP when I did have the custom skins on and it didn't let me join or spectate any matches. I quit the game, then took my backup of CloneTextures.utx and put it back where it was. I restarted the game then opened the Customize menu. The skins were how they were supposed to be. Incorrectly assuming that MP would work like before, I joined an MP match. It didn't work. I tried joining a game via Xfire, I saw a strange red and blue screen. I even tried to reinstall the game. It still doesn't work. I can create a LAN server and I could run around in there, but nobody could join. The following is the info about my computer: (When I uploaded my gaming rig info to Xfire, I got this info)

Processor: Intel(R) Core(TM)2 Duo
Memory: 2036MB RAM
Hard Drive: 309 GB
Video Card: Intel(R) G33/G31 Express Chipset Family
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2