That one I know about. Did you assign a material to the prop? If not, the only material an imported prop has by default is the one called "Preview". You would have to assign new material zone(s) to get anything else.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)