After clicking "add to cart", there will be a popup window, but on my website, sometimes the "show cart" link will not display in the popup window. It looks like this:(http://www.usbsc.com/showcartnotshowing.png)
Also, normally the cart module will autmatically update to show how many products have been added and the total price after you click "add to cart", but on my website, sometimes it wouldn't update. I think this is connected with the above problem, because they almost always happen together.
Related link:http://74.220.215.205/~tribecaf/index.php/casual/item/4-007-casual-shoes
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