The Locations Map is not intended to replace the "Location" field on forms. It doesn't affect it in any way. I.e. the Location field still works through Google even if the Locations Map is installed. The Locations Map just shows data entries which are having the location coordinates set either via a built in Location field driven by Google or via Location Picker module where a user can define data entry's location directly on a map. 

So if the Locations Map is not showing anything on a map then this means that there is nothing to show, i.e. there are no any entries on your site with a Location defined.