Having problems with libraries disappearing or not appearing properly

Plex Media Server NAS & Devices
2

The version you reference sounds like the Web app version and not the server.

Settings - Server - General will show you the server version.

Would it be possible to

  1. Restart Plex
  2. Let it set 2 minutes to startup and stabilize
  3. Settings - Server - Troubleshooting - Download Logs
  4. Attach the ZIP file it gives you.

This will let me see if there is a major server issue or if your issue is in the app itself.