If it appears to be rendering correctly with Nvidia mode, It could be an issue with OpenGL which drives the viewport display. I can't say for sure this is the issue as I haven't been able to find the same issue anywhere else. So all I can do is go with my intuition on this one.

You can have a look at what is happening with your display interface settings in DS by going to preferences/interface/current hardware features. Which should bring up something like this which will show individually is and isn't supported by your hardware just to rule that out as the issue.

Let me know if anything stands out. You can also check your log file under Help/Troubleshooting/View log and see if there appears to be any obvious errors there.