[Plugin: WooCommerce – excelling eCommerce] Cart and check-out aren't displaying

Hi,

I recently installed the latest version of Woo Commerce but now the cart and checkout pages don’t show anything. Even when an item is added to the cart it stays empty and is not even displaying the table or the message that says “No items in your cart”.

http://sky-agents.com/winkel/ (main store)
http://sky-agents.com/winkelwagen (cart)
http://sky-agents.com/afrekenen (checkout)

Can anyone tell me what the problem seems to be or could be?

Thanks.

http://wordpress.org/extend/plugins/woocommerce/