Continuing the discussion from Objects are displayed wrong in rhino viewport:
My display went wrong also.
The wireframe mode is ok but shaded or rendered are not. The shaded mode settings are set to default. Here is a picture in shaded mode:
If I export this object (block) and open the new file, it displays well:
If I draw fresh new objects, the problem remains;
I have tried without success RefreshShade and ClearAllMeshes.