Try running Plex with admin rights.
Clean Up Bundles
Some users suggested that cleaning up the bundles worked for them.
Perform a metadata refresh on the affected section.
They might be interfering with Plex.
Maybe Ad Block, uBlock, Ghostery, or other similar extensions are preventing you from loading the libraries.
Note: You may want to backup your data before going to the next troubleshooting steps.
Below youll find the steps to follow on Windows 10.
This may happen if you used different accounts to pull up the server at a given time.
Removing any information about the old account should help.
First, quit Plex and then follow the steps below.
