The listing pages all 404. Is there a mandatory permalink structure?
Also the plugin creates a LISTINGS page. But that page doesn't display anything. In fact, it seems to NOT respond to shortcodes. http://www.markdavidny.com/listings/ .. I can get the shortcodes to work on another page http://www.markdavidny.com/listings-2/ but the test listing in RECREATION does not appear.