Hello all,
Just wanted to tie-out the topic. I re-copied everything from my NAS to USB and imported ONLY the music, ISO, and CUE files. I usually copy every filetype JRiver support. This is where the issue started I suspect.
Then used Rename/Move and everything went as hoped. At this point it left a ton of folder.jpg files behind (probably because these images are embedded in the individual files). So far so good I think?
I went down from 91k files to 88k files and down 2000 folders that were left over from from operations ver the years. I will test this new library to see if everything is right and no cover art is lost, and eventually will make this my main library (and then backup all these new files to my NAS.) I did find about 50 files that had normal file sizes but were corrupt, JRiver put these in an Unidentified folder so I can clean up later.
It would be great if the Copy feature didn't fail with large libraries, but FastCopy did great and bypasses Explorer (which on its own would have worked well, but I had more control with FastCopy. Somewhere between Explorer and JRiver there is a buffer overflow when copying large libraries.
In the end, my goal was to eliminate all the empty folders or folders where the much had been moved out, but redundant files were left behind. In this respect I have finally succeeded! About 45GB worth...
Thanks for all the help!