Did you guys move your Plex data folder to a different drive perhaps?
Directly to the root folder of that drive?
If so, check
Settings - Server - General - ‘Show Advanced’
“The path where local application data is stored”
If there is only a drive letter in there, without a folder name, it must be written like that:
D:\ and not just D:
(adapt the drive letter to your own system, of course)
Covering the basics: The drive in question must be formatted with the NTFS file system. None other will work.
