Some movies have stopped showing up when I browse my library.

Recently a whole slew of movies have stopped showing up when I browse my library. I can find them and watch them using the search function, but I’m really baffled as to what is going on. Has anyone experienced this or something similar?

  1. activate debug logging (not ‘verbose’!)
  2. quit Plex Server
  3. wait 1 minute
  4. start Plex Server
  5. wait 5 minutes
  6. fetch log files and attach them here

Or inspect them yourself. Take a look at the Plex Media Server.log file and seek for messages about database corrupt or malformed.
If you find these, you may have to repair your database.
https://support.plex.tv/hc/en-us/articles/201100678-Repair-a-Corrupt-Database

Nailed the issue - it was the database. I repaired it and we are back up and running. Thank you!