We have a problem with our "Add to cart" module in our Virtuemart shop.
The first problem is that the module is set to display a modal popup message when a product is added to the cart, and this works fine in Chrome, IE10, Firefox and Safari but NOT in IE 7, 8 or 9.
The second problem is that the mini-cart information only shows number of products and not total amount, unless you refresh the page.
I have made a complete copy install on my test server where you can make "live" tests and modifications.
When everything is working in all browsers you can transfer the modifications to the real live site.