Counter Strike Source maps have lots of missing textures.

[iSpecYou]

I have CS:S installed and I wanted to play some Prop Hunt with friends.Since source maps are good for that I picked those.The problem is though, that all the walls and various other things have missing textures.Any suggestions on how to fix this?

[Rubat]

Verify CS:S game cache integrity, play it at least once, open Garry's Mod, in the bottom right corner, press on controller and mount CS:S

[iSpecYou]

I tried that, also reinstalled both games, to no avail sadly. :/ Any more ideas?

[Rubat]

The textures you are missing are not from CS:S then.