Another thing: If you can afford the render time, use IDL, not IBL. (Actually for me IDL is often faster than IBL+AO. But I have a fast computer.)

Here I enabled IDL and the color of my sky and ground is actually being used instead of some arbitrary colors in an IBL image.

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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)