Thank you for the replies. I did as suggested, and now I can delete books on the device from within Calibre. So thanks.
HOWEVER my main problem remains. These new library books, seemingly perfectly well formatted within calibre, and easily readable through the native ebook reader in calibre, do not open when I sideload them and then try to read them on my kobo. The first 'page' (cover, or what ever) appears, but when I try to advance the book closes, and ends up marked as 'finished' as if it was a single page document rather than, say, a 218 p novel. Any guesses what's going on?
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