Sometimes while I am working in my assemblies and I am trying to mate components together I find that the mates options in the on-screen menu does not appear. It seems to happen more often when I am selecting a face, edge, point, etc... that is more towards the edge of the graphics area. This shouldn't happen and I have been unable to find a reason why it happens. I have been seeing this issue since 2016 and for me, it seems to happen more often in 2017. I have not made the jump to 18 yet, so I don't know if this still occurs. I can say that I have seen this happen between companies and PC's so it does not seem PC related.