
In my case, the issue is the "allowedNetworks" property.I have a few different subnets, but one that I have NEVER had is 192.168.2.0/24 - which is what it decided to set that property to for some incomprehensible reason. The issue, in my case, is that it consistently wipes out the preferences file at /var/lib/plexmediaserver/Library/Application Support/Plex Media Server/Preferences.xml. Just had this issue myself, this page was the first result I found but the above answers did not help, so here's what I did to fix it.which has happened before, I think EVERY FREAKING TIME IT UPDATES, but I never remember the fix.so maybe I'll find my own post next time :)
