We're having some issues with the data being returned by the Reverse Geocode service. We had hoped an update that we were doing to our server would fix it, but that was unsuccessful. At the moment, we recommend either not using the service, or at the very least, double-checking that the information it returns makes sense. We're going to make a post in the Announcements forum that will go into greater detail, but I wanted to get a quick message out to all of the users who have reported the problem to let you all know the current status.