Hello Everyone
I had this frustrating issue with Rhino 6 wherein some detail views on a layout sheet would not show up on a printed drawing. I normally use Arctic with one small modification (Display Object Colour), I am not sure this is the cause of the issue, but it is the only unusual setting I could think of. Regardless, I am posting the solution, I ran the commands clearallmeshes + refreshshade and that completely fixed the issue.