I've been trying to get the Cache to work also.  Is it possible to pass in the config xml data instead of using the configurl and pointing it to a url?  Below is an example what I'm try to accomplish.

Example:
_juiceboxContainer = new juicebox({
                configData: '<?xml version="1.0" encoding="UTF-8"?>
<juiceboxgallery
    galleryTitle="Juicebox-Pro Gallery"
>
  <image imageURL="images/wide.jpeg"
    thumbURL="thumbs/wide.jpeg"
    linkURL="images/wide.jpeg"
    linkTarget="_blank">
        <title><![CDATA[Welcome to <u><a href="http://www.juicebox.net/" target="_blank">Juicebox-Pro</a></u>.]]></title>
  </image></juiceboxgallery>',
                themeUrl: 'jbcore/classic/theme.css',
                containerid: 'juicebox-container',
               
            });