Installing the previous version fixes immediately for me (1.14.0.1340)…
Windows:
https://downloads.plex.tv/plex-desktop/1.14.0.1340-0acc754c/windows/Plex-1.14.0.1340-0acc754c-x86_64.exe
Mac:
https://downloads.plex.tv/plex-desktop/1.14.0.1340-0acc754c/macos/Plex-1.14.0.1340-0acc754c-x86_64.zip
