Elevations disappearing in Parallel projection

I have had it happen in (2) separate projects now where an elevation/parallel projection view either disappears or part of it disappears. If I tilt the image slightly, what is missing appears. How can I prevent this from happening or fix this? There is no fog on. When I try recreating the elevation and then hitting last view to re-align the position, everything disappears again.

These are fairly large projects, but when it’s happening towards the end it means that I’m having to reposition a lot in layout because I need to make new scenes. Any thoughts?

See this: thread. You may want to weigh in there.

Thanks, I’ll move into that thread.