Msg24_7 is exactly right. Here's a tip - you can change everything else too! I put in different lights including an IBL, key light, and back light, changed the ground shader, and added a sky dome, adjusted my camera focal lengths, etc. Then I saved the preferred state. Now when Poser starts up, I'm ready to render with a nice ground and sky instead of gray background and shadow catcher only on the ground. Its much easier to delete these at startup than to add them.

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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)