It’s definitely a problem when Plex can’t even detect your Private IP address.
That makes me wonder about your computer’s configuration, any security or anti malware software, and how many network interfaces you have. Do you change between Wired and Wireless?
My first suggestion would be to troubleshoot the problem. If you’d like, restart Plex, wait a few minutes, and share logs.
https://support.plex.tv/articles/200250417-plex-media-server-log-files/
If you are confident that it was caused by a Plex update, you can revert to a previous version fo Plex.
