Mike, may be you're referring to the same problem described in the following thread?
http://www.sweethome3d.com/support/forum/viewthread_thread,8953
As in the example you posted in that thread, in the images that you posted in the Gallery I only can see that same kind of color difference, not sure that there is another cause for these images. Are you using plain colors or textures?
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If a long walk every day were healthy, mailmen would be immortal.
