Quote:
Originally Posted by zenji
Converting to epub in Calibre also solves the problem sometimes, it seems
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That would generally indicate that the cover is not properly identified in the epub metadata.
That is why part of my workflow when importing a new book is to open it with Sigil and run various checks on the epub. You can also use calibre's editor which has it's builtin bug checker and the epubcheck addon. I prefer epubcheck since that matches what many publisher use to check ebooks.