If you see these messages/popups it's a good sign that your lightroom is corrupted. As soon as you see them, you should have Adobe look into it. Things to look watch out for are when you use lens correction, and cropping- that's when this occurred for me. The techs had to reinstall and correct my old and new versions of lightroom in order for me to save anymore losses of my work and back ups. It is not good news for all my edits, but life goes on.