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Getting a bit desperate now: I've exported and reimported the data; uninstalled Calibre and installed an earlier (7.xx) version and am still getting the same result: several books that are in collections on the Kindle aren't showing on Calibre whereas some books are shown in multiple collections which isn't what I've done. Is there any way to delete all collections in Calibre so I can regenerate them? The "Collections" button is still greyed out.......
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