MarketPress "Continue Check-out" Button not working

The "Continue Check-Out" botton on page titled "Shipping Information" does not work. I can complete all of the fields and press enter to continue, but the button titled "Continue Check-out" on the next page (Payment Information) does not work at all, and I am unable to complete the order. The links appear to be in-active.

The store I am testing is saved at http://market8media.com/speakupstudios/downloads/

Is this a problem with the theme (Ecka downloaded on Themeforest.net)? Is there something I can change/update in the code for MarketPress?