Problem with pink-lined objects

Doubledome

L1: Registered
Jul 6, 2011
2
0
Some of the walls in my levels are purplish lined like a leak. I know theres no leak in the level because the object is inside an already existing valve level.
 

Doubledome

L1: Registered
Jul 6, 2011
2
0
This may sound dumb, but are sure that it's not because of cubemaps? Is the purplish stuff like a black/purple checkerboard pattern on reflective surfaces?

Edit: Oh my god my post count D:

I'm sure. You can still see the color of the object but when you get close to it you can see the purple lines.