Someone else may have run into this.
Converting an epub built in V5.9 with Kindlegen, an error is reported that "Cover is not specified".
V5.3 makes the following references to the cover
Code:
<meta content="cover.jpg" name="cover" />
<item href=l"Images/cover.jpg" id="cover.jpg" media-type="image/jpeg" />
<reference href="Text/The%20Giant%27s%20Robe.htm" title="Cover" type="cover" />
V5.9 makes the following references to the cover
Code:
<item href="Images/cover.jpg" id="cover.jpg" media-type="image/jpeg" />
<reference href="Text/The%20Giant%27s%20Robe.htm" title="Cover" type="cover" />>
When I insert the following into the V5.9 content.opf
Code:
<meta content="cover.jpg" name="cover" />
every thing works fine.