Quote - BB, quick question for you.

Is there a way to turn off (or on if it is off) Include IDL in SSS pass in Firefly?

No.

Quote - That might shed some light on what is going crazy when using both together.

But - I don't need any more info on the matter - the amplification of light in crevices is due to IDL and an effective diffuse reflectivity that is way too high. There's nothing else to say about it. Skin does not reflect 80% of the light that hits it - it absorbs at least that much.

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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)