katootje on "[Plugin: WooCommerce - excelling eCommerce] "succesfully added to cart"message gone?"

Hi,
I have made some shops with WooCommerce and now I try to help a friend with his shop. He ahs 3 products in his shop (no category page, all products are on the shop page). In all the other shops I made, when I buy a product from the shop page I get the message: Product succesfully added to cart, show cart - checkout. But in this shop I don't get this message. Only a small V appears next to the buy button, but no woocommerce_message on top. I get this message when I buy the product from the single product page. Is this line gone? Is there a way to get this line back on the shop page? Is it a setting or do I have to add it to a template page? And which page?
Site http://www.tombeek.nl/winkel

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