I've set up categories on the main site and on a basic shop

I've set up categories on the main site and on a basic shop (that i use for my New blog template) to recreate for all new shops.

When I use the global category side widget that displays a dropdown of the categories. It redirects me to a blank page that does not have a working url. I am afraid I don't have some pathway correct. I have a category that has a product in it on my test site.

Ideas?