Certain objects are transparent

[IMG_THUMB]http://img704.imageshack.us/img704/8871/csassault0002o.jpg[/IMG_THUMB]

[IMG_THUMB]http://img256.imageshack.us/img256/1112/csassault0001.jpg[/IMG_THUMB]

I just started noticing this, I have no idea what caused it or how to fix it.
By certain objects, I mean some physics props, static props, player models, etc.

I got a similar problem on WoW (Yes, World of Warcraft), I fixed it by disabling anti-aliasing.

I doubt it will work on Garry’s Mod but it’s worse a try.

Well it worked :ms:, but that’s weird… Why is it that I’m not able to use AA now when it had worked fine beforehand?

Is my video card about to hit the shitter or something?