Categories and products not displaying on MarketPress site

I'm new to WordPress and in the process of setting up my store with MarketPress. I have the GridMarket theme and WP Multisite installed but I've run into a snag. I've added categories, tags, and a sample product. They show up in my site dashboard but not on my actual site. I've checked all my settings and can't figure out what I've done wrong. I've tried Global Categories and Product Lists as well as Site ones but the product and categories don't show up in either set up. Suggestions?