Garee:

of course in the real world I expect some differences, it's just that this seems to be so very very different. I don't recall, for example, a similar expereince when switching from Poser 6 to Poser 7.
That clearly involved a major improvement in the Firefly engine, yet the renders from P6 and P7 were (to all intents and purposes) identical when using the same scene. I've probably got my tests backed up on DVD somewhere; the point is, I ran them, and had no issues.

Surely you'd accept that with gamma off, P-Pro and P7 should produce similar results?

EDIT: just did these histograms from the renders. The P-Pro one is generally much better than the P7, but with the fatal flaw that it's clipping the shadows!

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Windows 10 x64 Pro - Intel Xeon E5450 @ 3.00GHz (x2)

PoserPro 11 - Units: Metres

Adobe CC 2017