Marketpress- Shopping cart link is blank

Hi,

I am building a site with store capabilities. I have had some issues with the plugin, certian pages not displaying anything. I had this issue with the "products" page, but fixed it by using short codes.

My problem now is once I add a product to the shopping cart, then click "check out" it takes me to a blank page.

http://www.beaconspoint.com/clientdev/AIER/store/shopping-cart/

Any advice?

Alex