It seems that WordPress 2.9.1 calls the jQuery UI scripts more efficiently than before. Instead of simply calling for the core jQueryUI file, it calls each bundle (tabs, sortable, resizable, etc.) only when needed.
Problem is that this plugin only accounts for when the jquery-ui-core is called, and leaves the jquery-ui-sortable BLANK so nothing is called. Same scenario applies to the scriptaculous library.
A temporary fix is to simply call the core for each individual bundle rather than have them be missing when they're being called. That is, until Google hosts the individual bundles.