Great plugin, btw!
On my fatcow hosting, I have no problem with this plugin using the modified template, on the same WP version. However, on this hosting account, you can't send messages and when you hit enter, it just moves down a line.
Password to access page: worldchat
I viewed source and it seems the jQuery is up to date. footer.php has that wp_footer line you mentioned in another post too.
Any help would be greatly appreciated.