I have the most recent WP (3.5.1) and the most recent version of this plugin.
Everything looks fine but whenever I try to test the sign up process (whether sandboxed or not) I get "You must select at least one registration item.Please go back and select an item!" Even when I select 25 tickets and fill out the info. The page it resolves to is "/registration/?".
I have set everything up and created and targeted all the necessary pages.
Thanks for any help!