max 10 products per Category

I am using twenty eleven, and I only get a max of 10 products showing in my WP e-Commerce, even though I have more than that per category. Have tried to pagenate the category, allowing 20 products per page, but only 10 show on the first page, and I get sent to the original products page if I try to view page 2 of the category. Adding a new product pushes off the tenth product.
Any tips to help me show the whole lot on one page?