It offers to sens ticket to Autodesk, like always.
I had win8, max 2014, and yesterday i installed win 8.1, max 2015 - same problem. I would think that this is something about my computer, but most of another scenes renders fine. And its weird, that its working without Embree - cant believe that there is just Embree burned out in my processor, but the rest is fine.
i7 3770K, just in case. RAM is more than enought.