Today, I came into the server, everything was working fine, except for the map textures. I get purple and black squares, and white lines for for the physgun and walls/ doors. I haven't checked on any other maps, but I'll do that as soon as possible and report back to this topic. I'll also post some pictures.
EDIT: It does this in other maps, too.
PICTURES:
No pictures, because I deleted Gmod, forgetting that I had pics.