Thanks for the report and GPU spec. It seems mostly on Intel 640, 650 and Iris GPU. We are really sorry we haven;t been able to fix this yes but we can’t reproduce it on any of our Macs!
Can you mention what version of macOS you were running?
Thanks
We are still looking for a fix, but in the meantime there is this workaround.
There isn’t a way to fix the Geometry Viewers, but you can fix your rendered output in a Render TOP by going to your Lights and setting the parameter Polygon Front Faces = Back Lit.