its not easy to see the error, do as follow:
1. log in to the site
2. add a few products to the basket
3. go to checkout
4. at checkout page remove 1 product, when you remove look at the left down corner of the IE browser and in the middle of the process of removing the product you will see the yellow triangle with error, it is for a portion of second, after that it continue like there is no error (just I can see those things
BTW - its quite a work to translate, it will take me till the middle of the week