It seems that simply rolling back to a previous version of Plex resolves an awful lot of update issues, but we should still bring the issues up so Plex can resolve them. In the meantime, I was able to roll back using these instructions and everything is working fine for me again:
I rolled back to 1.19.5.3112-b23ab3896 and saved the install file to my Downloads folder for safe keeping. I think I will skip 1.20.1.3252-a78fef9a9 .
Jim
