Sounds like a video driver issue. As you've got an Nvidia card, go to their website and manually check for and download the latest driver. If you are on the latest driver, try rolling back one.
Sorry for the later response, the problem did not go away when I rolled back to a earlier version.
Don't know if it is my lut that is causing the problem. Hard to say
So you've tried both the latest driver available and rolling back?
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Huh. I'm on a PC, using LUTs every so often, more in some things than others. Not having any issues.
From looking at the specs of your rig nothing looks at all amiss. So looking farther afield ...
What is the media used and what created it?
Are you exporting directly from PrPro or queuing over to Media Encoder?
Do you have either Max Bit Depth or Max Render Quality checked on in the export dialog box. If you do, *uncheck* then both, export, and see if it still occurs.
Have you tried a different LUT? Let us know.