It may be because you're using a model texture. I've read they have different properties than regular bursh textures, and so they don't act correctly when applied to a brush. I don't know if this is completely true, although some of the vets here may be able to tell you since I've seen them repeat that you shouldn't use model textures.

I've had a similar problem. I used the white window model (under props_c17) in many places, and elsewhere I needed a larger window that reaches from the floor to the ceiling. So I made it of brushes and used the textures from the model I was using. But in-game certain parts using the texture blink black, on and off, untill you get about 8 feet away and it stays black (again, only certain parts).

Anyway, I'd suggest trying a texture that's not from a model. If it still does it... you got a seperate problem.

Edit: Hm, yes Omega, you beat me. So what if there is no regular duplicate? (Which is my case). I'd have to extract the texture somehow and recompile it?

alright thank you for all of the replies. I just searched through the textures to find it. It's called effects/metalfence007a. I'll try the radius thing. Thanks again for the help (i gotta get used to all this new stuff in source)