I'm having a problem when packaging an ePub in Content Server.
When loaded directly into Digital Editions, it displays normally, however when I add it to Content Server and get it with the DRM applied, it doesn't display the cover image (neither the thumbnail) and mentions the following in Item Info:
"The document appears to have minor errors that might cause it to be displayed incorrectly."
The ePub was converted from MOBI to EPUB with Calibre. I've tried with and without SVG cover and both doesn't work. It uses a cover.jpg file provided by the author as the cover image.
Is there a way to debug it in Digital Editions or even in Content Server (I receive no messages claiming validation problems)? Has anyone had this problem already?