In case anyone else is struggling with this issue, I did not see another thread or any documentation of this error.
When latitude and longitude decimal values are used to generate a map, the map visualization drill down function does not display properly unless the parameter skip_drill_fields, specific to location-type dimensions, is set to yes.
Basically, all my drill fields show up in the drill overlay, but the modal is otherwise empty. Not sure why the lat/long values prevent the filter from displaying results, but when skip_drill_fields is set to yes the map drills down on measures normally as expected.