Saw you guys updated your store from the RTF site, you need to change the main navigation for ardupilot.com to point to the new category in main store. site as it links to the old store. Maybe put some 301 htaccess redirects from the old pages to the new ones? Currently the old store is online and you might have some orders come in that way.
Just food for thought.
Just flew my new RTF quad today for the first time, what a blast!
Cheers
Mike