I often need to open a drawing, navigate around it, zoom in and out to see things, and then close it without having changed anything. At least, I don’t think I have changed anything. But SU often thinks I have. I guess it is something to do with changes of view within a scene, even though you may not have instructed an update. If I simply open, do not move about, and close, I get no warning about having changed something.
I don’t know how others feel but I find this confusing. If I don’t think I have changed any geometry or scenes, etc, I would expect the system to happily allow me to close the drawing without warning. If I get a warning I start worrying about whether I have changed something which I either want to keep or not.
There may be a good reason why SU logs a change in viewing as a change that might need to be kept but I can’t see why. If others agree that SU should not register such changes, I might move this to a Feature Request.