Checkout: Shipping Rates --> Order Total Auto Update

Hi guys,
another question on commerce kickstart. I have created a few shipping options with different prices. These options are now displayed on the first page of the checkout process.
Below these options is the shopping cart and on the bottom of the page the "Order total" which I want to update itself automatically depending on which shipping option is chosen.
When I change the shipping option, I see that something is going on with AJAX, however the "Order total" sum does not change.
How can I make this work?
Thank you

Posted: Mar 30, 2013