Product Category not pulling in product list

I've got 3 categories set up. The products are categorized into those 3.
When I click on a category URL --
the page returns:
No Results Found
The page you requested could not be found. Try refining your search, or use the navigation above to locate the post.

The current site is using an older version of this plugin and looks like this:

I can't figure out what I'm doing wrong and there is no documentation to read.