@BullBates - weird, maybe the database is empty. How big is metadata.db - an empty database is 339,968 bytes, or 332KB
Try this:- close calibre, rename the folder, start calibre, then repeat my previous post.
Otherwise create a 'new' library and use the Add Books from directories, one book per directory option to add the books in that 'problem' library to the 'new' library.
BR
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