Supermassive/MarketPress Theme Issues

Hi again, Got MarketPress working on TwentyTen, however Supermassive by Ghost Pool/Themeforest.net bombs. I used a shortcode on this page to display the products: http://test.salesexcellence.com/store/ but when you hit the checkout it goes to a list page not the checkout. Do you think this can be fixed? Thanks again! - Josh