I've been having the same issues for the past few weeks since updating. I'm running version LR 3.3 on MacOS catalina Version 10.15.5. when I got to select a different image, it doesn't move. I constantly get the blue spinning wheel of death. Also, all my editing tools are grey'ed out. It's becoming a real pain. I have to force quit etc. it sometimes works and other times I get the problem I described above. Any assistance would be appreciated.