If I check NamedView “Restore aspect ratio” option checkbox, and the ratio is changed, strange artifacts are displayed along the edges of the viewport. In the following screenshot the artifacts are displayed on left and right side of the viewport. Another problem, clearly visible in the following screenshot is 5 empty panels. These panels appear when I switch display from laptop (HD) to monitor (4K).
There is also a flaw in the NamedView thumbnails. If the Auto-update thumbnails option checkbox is not checked, the thumbnails sometimes display images of different Rhino models (3dm files).