3D-Mobster- That wall is part of a starship bridge product. I'm going to try some more ideas, but if those don't work, I'll send you the rear wall that's giving me the problems.

bagginsbill- Thanks for that link. I tried adding an infinite light to my scene, but I got the same results. I'll try a point light and see if that makes a difference. Though I think your comment from the other thread is correct and that Poser just won't do what I want it to do.
I could use Reality (or Lightwave or Vue), but I'm trying to keep the rendering within Poser so I don't have to adjust all the materials and I don't want to spend 10 hours waiting for Reality to finish rendering.

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