I have no idea exactly what I've done.
I set up a new computer, and downloaded 31 and renewed my license. Got everything going.
When setting up options, I had the bright idea to move my cover art to the external HD that holds my library. Got the message from Windows that I lacked permission to create the folder on the external HD. Okay. But then I couldn't remember the path for the original, default, location on the C drive. Tried searching in Windows explorer for various permutations of MediaUser\AppData\Roaming\JRiver\Media Center 31\Cover Art\. Nothing found. Just searching "cover art" only turns up stuff for other programs.I don't know if I obliterated the cover art on C somehow.
So in JR, I now have about half my cover art--I guess somewhere along the way somehow that got saved with the file.
Any ideas? Much obliged.