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Thanks BetterRed. I'm currently playing around with it. Strangely, switching the logo in my docs for a different png file sometimes works for Calibre. So maybe it is possible that Calibre doesn't like my png file and the jpg based on it, though I have no idea what would be different about it. Seems to be replicable. I'll hope someone looks at my files and works out what Calibre is "thinking"!
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