[Plugin: WP e-Commerce] 404 when using shortcode

When I put the shortcode of a category, e.g. [wpsc_products category_id=’10’] into a page and make the main shop site http://www.domain.com/shop/ the parent of that page (thus http://www.domain.com/shop/cat10/), then I get a 404 error.

When I give that “cat10”-page no parent site, then the error does not occur and everything is fine. But how to make pages work as childs of the “shop”-parent?

I did not had this issue with some previous versions ago, so it must have to do with one of the updates recently provided.

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