url shows %wpsc_product_category% instead of category slug

Hi!

I made a wordpress website with wp e-commerce webshop for a client, but the product pages are not opening in IE. I figured out that this is because it says ‘%wpsc_product_category%’ in the url, which is fine for chrome and firefox, but appearently not for Internet Explorer. I took me a while before I figured out why it displayed %wpsc_product_category% in the first place, and I’m still not sure, but I have figured out that it has to do with this q-transle-slug plugin. Instead of displaying the categoryname, it displays %wpsc_product_category%. If I go to the product page directly from withing the wp admin panel it displays the category correctly and that page I can open in IE. Unfortunately all the links to the products via the product overview page show %wpsc_product_category% instead of the category name. If I disable this plugin it breaks the rest of my permalink structure, but the category names for the webshop are at least displayed in the correct way. Do you know how or where I can solve this?

thanks in advance.

https://www.ads-software.com/extend/plugins/qtranslate-slug/