Strange texture disappearing problem...

[Funky Munky]

Alright I started working on a small single player map today and I have a problem in my first room. I have the walls textured but when I pick up a physics object using right mouse button my texture disappears and when I drop it they reappear. At first I thought it was the light source but I simplified it down to one single light source on the roof. I can also see the textures if I spin around at certain angles. I think its something to do with the point of view in the coding or something.

Has this happened anyone? Shine any light on this subject...

 

[Funky Munky]

They reappear when I grab a weapon too.

This is so weird.