I need help! (Mats. not showing up)

I bought the gmod/CS:S package from steam, and everything was working fine, all textures showing up.

As of late, I get the checker-box design on: ALL CS:S guns, most CS:S textures, and some HL2 textures.

This started to happen after I downloaded the Spacebuild stuff, and I first noticed it in the map gm_newworlds. I also get just an outline for some things, like stairs. (No texture, just white lines showing where everything is.)

I tried to uninstall the SB stuff, but it still was happening.

Any way I could fix it?

Verify your game cache.

Make sure CSS is mounted?

Try reinstalling your g-mod, though back up your addons if none of the listed work