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Thank you for responding, mysweety. I ruled out a problem with the cover image itself by attaching the cover to a different epub. It worked fine. Similarly I tried a cover from a working thumbnail epub on my non-working epub. This didn't work. The problem followed the book, not the cover.
Member Almiel kindly checked out my non-working epub on her PB360 which is running firmware v14.2. It worked fine there. I'm running v15.2. Consequently I don't intend to do anymore with this problem until the new firmware, v15.3, comes out.
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