Plex Library empty but collections/recommended work fine (plays movies too)

Plex Media Server
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2

First, try Cannot see Playlists, Smart Playlists in Plex Web - #2 by OttoKerner

If that doesn’t change anything:

  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.