Rhino 5 3D model display issue

Hello all,
My computer environment is a Macbook pro, I run Rhino5 by Windows system (bootcamp)
I was doing sunlight hour and radiation study, but my 3D model was displayed in a weird way:

Did anyone of you see this before?
What can I do to resolve this issue?


This is solved by closing brep preview :slight_smile: no more question now