I am currently using woocommerce, and I've been testing the add to cart functions for about a month. I just upgraded to woocommerce 2.0.20 and everything works except for the add to cart function. I can not add products to the cart. I deactivated all plugins, verified the php is set up correctly and still no luck. when I click the add to cart button the request is made but there is no response from the server. It stays in a pending state.