This may be totally off base, but going back to Poser 6 I've had issues with IBL not doing what I expect, particularly it is always bright and washed out, unable to produce darker areas.

The "Contrast" parameter affects this - perhaps the contrast interpretation has changed?

While I understand the nuisance that existing scenes don't obey your careful tuning of the past - it may just be that we have to re-tune everything, even if Gamma is not involved. So far - yes some of those Pro renders are darker - but maybe they are more correct?

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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)