You are correct that MC does not show any tags to all the files listed as unassigned. I'm confused since iTunes does show the tags (and album art). The same thing is happening with album art. Which that being the second issue or "Step" I wanted to undertake before I figure out why MC was placing such a huge number of files as unassigned. Just too explore the option that I would have to re tag all the files, any suggestions for a quick and painless method of doing so? I have DB poweramp. The thought re tagging over 800 folders seems like a task I would want to answer the question why one software sees tags and the other is erasing or not seeing the tags first.
And there's more information. Being a newbie to JR, I didn't realize I had created a separate folder within the music folder that either iTunes or JR was relocating files. Basically I had duplicate folders but one would contain the file and one would not. A mess that I spent a number hours re consolidating and organizing. So, originally, these files were in JRiver MC22's library with correct tags. The issue then was album art, JR either would not show it while the tag said an image file was present, would not allow the internet to paste, or would not recognize the folder.jpg.
Rebuilding and reloading the library was the intention to catch the album art. I noticed deleting the files and importing a second time captured updated folder.jpgs.
Now, 98% of the folders will be in the library with album art, but almost all the folders are incomplete missing the files/tracks be dumped into an unassigned folder in JR's library due to missing all tags with the exception of the name of the file. Went from one problem to another.