Before upgrading I always set up and render a test scene, then apply the upgrade and re-render the test scene. I could find no appreciable difference in the renders after applying SR1, certainly nothing close to the magnitude shown in your example.

How certain are you that nothing changed in the scene? My test was set up so that I am 100% certain that everything remained constant: lights, shaders, camera, render settings, gamma settings etc.

Do you use D3D's Render FireFly script to set up renders, or the Poser Render Settings dialog? If the latter, do you use Auto or Manual? If 'Auto', it could be that the same position on the slider invokes different actual values after the upgrade.

Your images are so very different that I have to conclude that something significant has changed in the scene.

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

PoserPro 11 - Units: Metres

Adobe CC 2017