Hello Robert_U,
This is the version running on my laptop with NVIDIA GT750M
this one, instead, on the Mac Mini
I also noticed that during the first frame on the integrated card, shadows are somewhat rendered correctly even though they're not in the right position.
Unfortunately i'm not able to grab a screenshot in that exact moment, so (i can't believe i'm actually saying this) i took a photo of it:
Thanks,
Riccardo.