Quote:
Originally Posted by kovidgoyal
Check the permissions on the files. They need to have both read and write permission.
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Ah, that's it. I add books from archives by opening the archive, selecting the book(s) I want, and extracting to the auto-add directory. I just re-extracted one of the files that didn't add and hey presto, it's marked read-only. This doesn't cause any complaints about permissions when I manually drag-and-drop from the auto-add directory to Calibre and then delete, so I overlooked that possibility...
Many thanks, as usual!