I updated to Sierra and then also updated to the latest Plex Media Server (Version 1.1.4.2757-24ffd60).
Now the server starts and is accessible for 30-60 seconds and then it stops working. I can't access anything from my AppleTV and nothing is accessible directly via the web interface. If I try to look at settings I can't go to the server tab, I get "Server settings are unavailable." If I attempt to check for updates I get "You must be lost. This page doesn't exist". Well great this is going well.
So I quit the server and restart. Works for a few seconds and cactus again.
So we are stuck in a loop.
One weird thing does happen on the AppleTV. The usual server is displayed as offline, but a new (unsecure?) server is available to connect to with a different name.
Anyone had a similar issue?