When you say reinstall, do you mean a reinstall of calibre, or a reinstall of the O/S on the machine?
When you say
Quote:
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the Calibre Library went back from my backup OK
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I take it as being you restored the entire calibre library from a backup.
If you browse to that location in either the command line, or Windows Explorer, what type of entries do you see in that directory?
For instance, when *I* browse to the location of my calibre library I see