Zhaan: The change that does this is the last of the three you listed. With this, calibre is always adding a cover image into the book even if there currently isn't on. It might not get displayed on a page, but it is there for applications that look for it. In 2.60, an option was added to turn this off:
Quote:
EPUB metadata: Add an option to disable adding of cover images to EPUB files that declare no cover image in their metadata (Preferences->Plugins->Customize the Set EPUB metadata plugin)
|