Site Categories plugin doesn't show sites

The plugin loads fine as does the widget and they both show counts but when you click through to a specific category the resulting page does not display any sites in that category.

Home page widget: http://www.trailsherpa.com/
Landing Page: http://www.trailsherpa.com/sites/
Category page: http://www.trailsherpa.com/sites/backpacking/

Any ideas?