Make sure all of your normals are facing outwards.
Double-check your UV map.It may be either that, or you gave that part the wrong material.Also, what are you making?
Hey ShadowsfeaR can I script it?
Why are the two parts that are supposed to be gray difference objects? Unless it's because of animation, combine them with control+J.
You are just like spartan101. You want to script everything, and spartan101 wants to add hand animations to it. I'm guessing he will make a post for wanting to hand animating it.
Spartan101 is also usually more idiotic anyways.
if you use blender.