A simple way for the user to check if their problem is related folders being locked or not is to revert to version 6.19.1, the checks relating to folder locking were introduced in version 6.20:
Quote:
Release: 6.20 [09 Jun, 2023]
Bug fixes
Windows: Make moving files in the calibre library folder more robust, locking folders in addition to files, before the start of the move
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