Raytraced viewport rotation shows bg color

I updated my driver and did the reset and now it seems to be working.

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I have checked the XML files attached against a known to work configuration. I see two keys missing from the ‘faulty’ ones, but those are from the underlying display pipeline. I suppose those put the drawing into some state where not everything on OpenGL level was drawn correctly. Those changes shouldn’t happen anymore- nor are they possible to make through the Rhino UI. So I 'll consider this issue now fixed (or rather fixable with reset).

Thanks to all who have helped figuring out this issue.