I have the same issue with Revit 13 but it isn't a project that has been upgraded. The other suggestions above do not fix the problem. See attached screen shot showing handrail in plan but not in section or 3D. Has anyone heard of a fix yet?
I'm having the same issue as well. Again, from the Revit Sample Project. I wonder if that sample file is corrupt - has everyone started with a railing from the sample file?
It's not just the sample railings. I'm having the same issue with Viva glass railings as well. It's very random and the only fix seems to be to recreate the railing.
I found a possible source of the problem here:
Turns out when you remove all the balusters from a rail the "flip orientation" arrows don't know where to go and end up far away from the railing. I had problems with the railing not showing up at all in section views but when I flipped the elevation to look the opposite direction the railing would appear. The railings dlip arrow was behiond the section cut line so the rail wouldn't show.
1) add in baluster and then shut the balusters off in the section views
2) create small blusters that look like wall mounts.
Thank you Paul - that's it.
I've got a model now started in 2013 with railings created in 2013 and have been having the issue again. I have already noticed that non-appearance in 3D views is dependent on using a section box (as I usually do for viewing stairs within the building) so I had guessed there was some rogue geometry flying around somewhere, but had been unable to find out how to stop this in a section.
I have now checked that flipping the stair section brings disappeared rails back as described, and by making an entirely empty baluster family and including it in the railing visibility returns to the top rail in all views so far.