CSS weapon models and sounds reverting to low-resolution placeholder

[Mongoose]

I also posted this on Facepunch but I can't figure out why it's doing this.

CSS custom sounds no longer work, and not only are my custom textures not working, but they're using the low-res placeholders for when you don't even have the game.

Anybody have any ideas?

 

[Bounty Swift]

Validate the game cache
boot up css
re-install css
re-install steam
re-install windows
get an alienware

do so in descending order