Displacement will not render in 3.4, fine in 3.2, Xeon E5-2699 v3 machine specific

[irwit]

Hi all

So I have a strange issue on a new machine.

Quite simply, displacement will not render. Render times go from a few seconds to 30minutes plus on my machine. On other machines, same spec, it renders as expected.

I tried as a test going back to Vray 3.2 and it renders as expected. My machine is Xeon E5-2699 v3 dual processor, 128 gigs of ram. The only difference between my machine and one that renders fine is the gfx card. I have a 970GTX and the other has a K6000 Quadro. I know I had to install a different chipset driver so I'm wondering if this and Embree has some kind of issue and it can't render displacement. Everything else renders fine.

As a side note, I also can not render in unity on this machine, it crashes out instantly but leaves a note in the log about Embree which is why I feel it is an Embree issue.

Any help on this would be massively appreciated. I've spent a ton on this machine and its not working as hoped currently.

Cheers for reading.

Will.

[svetlozar.draganov]

Can you create one very simple scene with displacement and render it on both machines with same specs, then send us the V-Ray Log files and render outputs from both machines?
Send us the scene as well so we could see what are the displacement settings and other important parameters.