I can sympathise - I spent hours at the weekend getting some bought imported models to look good.  Saddly "standard" model formats are not as "standard" or transferable as we might like and materials are the usual suspects when it comes to finding a fix.  There are all sorts of things in textures that may need tweeking for renders that look fine in OpenGL.  The ones causing me problems at the weekend were:

• Reflection maps that need inverting
• Reflections set to 100% on materials that shouldn't be reflective
• Bump maps / Displacement maps that are extreme, inverted or missaligned
• Highlight colours that are either black or white

I ususally start by turning Reflections, Bumps and Displacements down to almost off for the materials then add them in a bit at a time.

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