I updated to LR Classic 2021 and have had nothing put issues since. I can use the app for a few minutes and then end up with the beach ball of doom. I've tried unloading and reloading to no avail. This is killing me. Every time I hover over one of my presets. (not clicking anything) the beach ball comes up and the only solution is to force quit.
I have edits that I need to make and can't even revert to a previous version because the new version updated my catalogue and can't be read by previous versions.
I need to remember my rule of never being an early adopter. Lesson learned.
Bug, Crash or freeze, Download and install, Mac, Performance, Presets or profiles
I'm also having crash issues - on PC with PS and LR. I've rolled back a version for now. When you upgrade the catalogue, it renames it to V01 or similar, so your old one should still be there, or maybe one of the 'bakup on exit' copies if you had that set.