This looks like a recent display bug. What version of Rhino are you using? If it is Rhino 6, can you post the results of SystemInfo in Rhino here? We saw this with Intel series 4000 integrated graphics chips IIRC…
This looks like a recent display bug. What version of Rhino are you using? If it is Rhino 6, can you post the results of SystemInfo in Rhino here? We saw this with Intel series 4000 integrated graphics chips IIRC…