My Plex server has this problem. I will try uninstalling and reinstalling. Integrity issues like this are a deal breaker because you cannot trust Plex to do its primary job (which is record shows and enable watching them).
Edit:
After uninstalling and reinstalling both Plex Server and Plex Player on my windows 10 PC, this did not solve the problem. I am running a new experiment. I stopped the Server and renamed the d: drive to e: . This is the drive which contains the media libraries and I restarted the server. I deleted the c: libraries from Plex Server and pointed to the e: drive. I will see if this will fix this problem. If this does not work, I will both uninstall the Plex software and delete the c:\Users\xxxx\AppData\Local\ folder. I think this will require me to reenter all my configuration data. I will update this posting with a description of the results.
