I've been working on a few drawing jobs in 2016. And, I've noticed in plan sets that my drawings keep changing. On my structural sheets I've added the floor plan and changed the drawing mode to floor system. Everything looks good when I get it all lined up and set on the plan set sheet. Then I go into the drawing and make a change on drawing mode and all of a sudden it changes on my structural plan set sheet. I've caught and changed this several times. But today a set of drawings got stamped and sent to the builder, owner and county. And, then we found out the floor system drawing had actually changed to the drawing mode again before I exported the PDF. So, now, it is not only frustrating, but costing us money on reprints, etc.
So, beware- drawings that are in plan set sheets will change mode visibility without warning.