I'm not getting the Business Listings menu in the Admin area (in the menu on the left) if I have the WPMU DEV Dashboard plug-in enabled.
Please try to set the plugin in deactivate mode and then look up and then let we know it that what's happening.
That's what I'm reporting, when the WPMU Dev Dashboard plug-in is active, the Business Listings options do not appear but they do when that plug-in is disabled.