Back then saving from a single S/E viewpoint multiple views with different layer combinations led me to trouble. Plan and S/E & 3D Document are different species of “viewpoints”, and there was some issue with drawing updates —I had to manually update each of them, making sure they stayed in manual, couldn't update them at the same time, so it was less painful to just create two markers. I now found myself creating views with different RFOs from the same S/Es without a thought, and things working so far, but then wondered —if you haven't heard of trouble, there must be none.