Occasionally you might find that you get strange effects on some servers when you use the S3TC textures - these can be loss of character animation and dead people's corpses appearing like 'zombies'. 
However, here is a fix that cures this most of the time. First make sure you have already installed the S3TC textures. Then go into your UnrealTournament\Textures folder, take out the skin textures (Female1Skins.utx, Female2Skins.utx, Male1Skins.utx, Male2Skins.utx, Male3Skins.utx, and SkTrooperSkins.utx) and put them in a temporary folder. Place s3fix.exe in your textures folder. Run it, wait for it to close, and then drag the skin textures back in the textures folder. 

