I've been trying out a lot of shaders recently and some of the ones with demos works perfectly, but when I try to put them in myself almost everyone turns out completely black. I've tried multiple cartoon shaders and the only effect it has to my models when I attach them is to turn them to a complete black color. Is there something I miss in my code maybe?

I have a ATI x800 PRO with the newest drivers and A6 Commercial v.6.31.4