How are you supposed to launch the scan? Please include this information in the docs, e.g. right after the perfunctory "How to install" and on the FAQ page. I know GoDaddy isn't known for intuitive UI/UX on their sites, but it's sad if you've spent all this time developing a potentially useful plugin but you don't bother to tell anyone how to use it. I don't see any errors in my PHP logs, and Firebug isn't complaining about anything... the plugin is enabled and happily doing nothing from what I can tell. If you've got any pointers, I'd strongly recommend putting them in the docs so others might benefit from the plugin.
Version 1.2.0 of the plugin on WordPress 3.3.2