Products Page, Checkout not displaying

We are using a theme called Linguni from Theme Forest. The products page and the shopping cart are blank. However the individual products are visible. When switch to a default 2011 theme it works fine.

http://dezire.websitewelcome.com/~httphawk/store/products/

Need to find a way to make it work with this theme. FYI we have no code or other advanced knowledge of wordpress.

Thanks,
Chris