It is difficult to identify bugs in advanced options (Options>Advanced) because there is no documentation of the advanced options. One of the bugs (I do not remember which one) crashed Rhino yesterday. I remember two bugs:
Rhino.Options.UiPaintColors.TabBackground does not display its color and it cannot be changed. I have posted the following screenshot to prove that this option existed a few hours ago. (It is the last one.) To my surprise, this option disappeared.
Rhino.Options.UiPaintColors.TextDisabled does not remember its default value. When I changed its default value, my user-defined value became its default value.
_______________________________________
It seems that nothing is more frustrating than changing bright/dazzling Rhino interface colors to dark/comfy colors. Most of Rhino colors are not documented. Some colors are controlled by buggy Windows Themes.