[Plugin: WP e-Commerce] Internet Explorer empties cart when I add a product twice

I’m working on getting a site into fully working conditions and have run into an odd issue.

First, the product pages add a product, one at a time, to the cart through ajax. So to add more than one (or different variations), you need to click that button for every product you want. Works great in all browsers except Internet Explorer.

In IE, the first product adds fine, but then you click to add another to the cart and the ajax request returns nothing. To make things weirder, the shopping cart is empty. So I booted up Fiddler2 to see what’s going on in the request headers, here’s what I found:

First product add: wpsc_ajax_action=add_to_cart&product_id=572&variation%5B52%5D=53
Second product add: wpsc_ajax_action=add_to_cart&product_id=572&variation%5B52%5D=53&quantity=0&key=0&wpsc_update_quantity=true&wpsc_ajax_action=empty_cart

For some reason the action “empty_cart” is being tacked on to the request when on IE. Has anyone run into this issue, solved it, or know what I can do to fix it?

Thanks,
Faison

http://wordpress.org/extend/plugins/wp-e-commerce/