Missing textures since last update.

Since the last Gmod update i’ve found that a lot the previously working maps have missing textures and models all of a sudden, i’ve tried redownloading the maps but nothing changes.

I’ve validated the gmod cache as well and still nothing, does anybody know whats causing this?

If anybody knows anything, or there is somthing i’ve missed please help.

I’m having this problem with Half life deathmatch source, not sure if anyone else has this problem