In Lightroom Classic: When I view an image in LIBRARY mode is is ok...when I switch to DEVELOPE the image dissappears... this has never happened before in Lightroom...been using Lightroom for 6 years.
I have this problem or something like it once every few days, too, on MacOS. The file is fine; going back to library and develop usually shows it. In library, I just see the gray background. For me, it's been happening for a few months -- longer than just the most recent release.