Problem with model and black textures

[V o l T]

Hey
Recently I tried to make a model to map editor and the problem I have is with texture. The garage when I am adding texture have grey roof. Then when I open game and add the garage, roof is like really black, but should be light grey, why is happened like this, how to repair? I tried to add flat, vertex color and the wireframe visible and it didn't help.
[ external image ]

[LadenSwallow]

Are you using OpenGL or DirectX? I've seen plemty of black textures when using OpenGL - they musst be saved with correct DDS options to appear in OpenGL