I too have lost the function of the Layers tab. I am using Rhino 4 and Bongo in Windows 10. (I have been a Rhino user since it was a free beta version in 1998[?].) I tried uninstalling/reinstalling Rhino, which I assumed would fix anything, but that didn’t make any difference. I looked here on the forum and tried right-clicking the top of the tab (nothing) and updating my video drivers. The problem persists. Suggestions?
