WP 2.3 Categories and a Plugin

I recently upgraded to 2.3, and kinda freaked out because the categories was missing from the SQL, especially since a plugin I use was causing an issue with Categories showing up in the Admin panel, which also meant that no posts were showing. Finally figured it out after a few hours of major concern.

I was wondering if anyone knew how to make this plugin 2.3 compatible? I do well on themes, but plugin code is not my thing.

[moderated code at http://wordpress.pastebin.ca/746771 ]

Any help would be appreciated. TIA.