Looks like jQuery has removed some deprecated items in 1.9, specifically for this plugin, the browser property of the jQuery object is no longer there (http://jquery.com/upgrade-guide/1.9/#jquery-browser-removed). Looks like you use it in a few places in the main JS file.
Also encountered the same problem
Sweet, if someone can submit a pull request I'll happily merge. Thanks :)
It's fixed - ready to close this issue too ;-)