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Yes, it was.
After deleting the Kobo Metadata plugin, and restarting Calibre, the problem is gone.
What is strange is that the problem appeared only in Calibre 7.24, not before.
Maybe it's related to the new feature : "Add from ISBN: Add a checkbox to automatically convert obsolete ISBN 10 to ISBN 13" ?
I'll check the Kobo Metadata thread.
A great thank you, anyway !
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