I am not sure if the title is correct, but what would cause borders to sometimes appear and other times not? This is somewhat of a nuisance.
the answer might be here: https://www.reddit.com/r/SolidWorks/comments/2k485t/shaded_with_edges_not_showing_edges/ . I am posting this because people might search for this question. I think that these forums are not used much, even though there are thousands of active users. Let me know if i should not post known information.