Shading errors across surfaces


I repeatedly get shading errors across surfaces, as though shadows are being cast, where there is no change in the plane of the surface. I have recreated these elements and no rats nest when exporting as OBJ from 3ds max.

Can anybody help?

Thanks in advance

RickySF Shading Problem

Do you have ngons in your model? I got similar problems because of different triangulation between software. Try to triangulate your mesh and check if the problem still occurs.
That was the first thing that came in my mind when i saw your problem.