MarketPress Coupon Problem- The link is not working

Hi I have marketpress running. Since the WP update 3.4, the coupons are not working. When you click on "enter coupon code" noting happens. I have this installed on another site, and it works.

I have been trying to ask for help on the forums, but not much response. Please help, I am trying to run a coupon promotion for my clients.

http://www.lncofsocal.com/store/shopping-cart/

I made a coupon code called "TEST" to use.

Alex