Sorry for such a basic question, but I can’t figure out why the top, front and right view does not display anything, while the perspective works perfectly well? When I try “ZOOM EXTENT” in these viewports, nothing came up, nor can I “ZOOM SELECTED” when selecting the object in perspective beforehand. I have restarted Rhino but still nothing changed. the Right viewport doesn’t even show a CPlane. Any ideas how to resolve this problem?