Map/Texture problems

Hello!

So a couple weeks ago i got on gmod and joined my friends server, and i couldnt see the map or any props and the money. Even now when i switch servers i cant see anything. I can see through walls, through the floors, purple textures everywhere, and weird white lined structures all over the place. Idk whats happening but i have CSS and ive played gmod a lot before i have around 500 hours and idk why this happened. I verified the integrity of the game cache of CSS, and its in the middle off updating HL2 so ill relauch Gmod once its done. Any help will be appreciated, thanks!

Make sure to mount CS:S by pressing on the controller icon in the main menu of Gmod and checking CS:S