Product page not displaying products

Hi. I'm new to WPMU.

Just installed MarketPress on my site for ACS (currently under development)

Anyway, I've added some sample products and assigned them to various categories etc. But I notice that the products page (under ACS Store) doesn't display them. It seems to just display a random image from one of the blog posts. Is this a conflict with the StudioPress theme I'm using?

Also any of the category pages only displays a single item despite multiple items being assigned to each category.

Thanks in advance for any assistance you can provide.