[JSWolf]

This could be the code causing the problem for jackets. It's at the end of jacket.py.

def is_legacy_jacket(html):
    nodes = html.xpath('//x:h1[starts-with(@class,"calibrerescale")]',
            namespaces={'x':'http://www.w3.org/1999/xhtml'})
    if not nodes:
        nodes = html.xpath('//x:h2[starts-with(@class,"calibrerescale")]',
            namespaces={'x':'http://www.w3.org/1999/xhtml'})
    return len(nodes) > 0

def is_current_jacket(html):
    nodes = html.xpath('//x:meta[@name="calibre-content" and @content="jacket"]',
            namespaces={'x':'http://www.w3.org/1999/xhtml'})
    return len(nodes) > 0