WooCommerce Website Bug Fix Needed

We're looking for a Wordpress expert who can troubleshoot our problem. Ever since we updated to the latest version of WooCommerce 2.4.4, all the products in our shop cannot be added to the cart. For example, please look at this product: [login to view URL] When you click the [CHOOSE AN OPTION...] dropdown menu, it should normally give 4 choices: Black, Silver, Blue, and Gray. However, when you click on the dropdown menu, nothing appears. This is the problem, and we believe the theme's template for [login to view URL] is incompatible with the latest WooCommerce update and needs to be tweaked. Our budget is $40 USD to fix this problem. Please bid now if you know how to fix it