I'm having the same/similar problem.
Running Plex Media Server 1.3.0.3059 (latest) in it's own Jail (not the plugin system)
Freenas 9.2.1.5 (yes I know it's old, no my system isn't compatible with 9.3, no I can't afford annoying better, yes I'm constantly scoping replacements)
Saw the error message below repeated many times in my freenas logs:
Code:
Dec 5 20:35:14 freenas kernel: pid 56396 (Plex Media Scanner), uid 972: exited on signal 11
Symptoms.
I just re-added a movie that I ripped a few weeks ago, so metadata already exists in the DB. Movie is shown as new inside plex web interface when accessing via IP directly on local network.
I just added a couple tv shows, metadata does not exist for the episode inside the DB. Also moved some TV shows between pools. New TV shows are not appearing, and TV shows I moved are not appearing (show as unavailable).
As the above is all within the Plex Media Server application, the problem is not related to the player.
I suspect the TV scraper that detects shows is not finding the episodes, perhaps blocked or a crashed process.
When I hit refresh in the Plex Media Server web interface, it instantly says Metadata may still be downloading, so it appears to crash and then show the default message.
Actions.
Restarted the server (freenas host), working fine now. Will report in if this happens again. Hope this helps someone out there.