All what I have described is happening on the same NVE SSD (and other internal disks in the same computer). I don't use cloud or NAS.
I have done what Kovid suggested (create an empty library and filling it with the books of another one): this work fine except I los all the metadata painstakingly assembled/created from different sources (series, blurb...): this technique allows retrieval of the epub, but not the opf!
How can I fix that? I would have 45000 sets of metadata to retrieve and adjust...
PS I am playing with copies, the original library is intact!
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