Over the last couple of years we have had customers run into problems from time to time if they are trying to use modules such as Dynamic User Directory or Interactive User Import/Export to import/showcase users within DotNetNuke and then they might have discovered that while using Dynamic Registration to register users, they were not always “linking” the Dynamic Registration fields to DotNetNuke Profile Property fields. In the future we might force each dynamic field to be mapped, or at the very lease make it a required field and have it be “very recommended” even, if one of the options is still not to map the field. Mapping each profile property is really the recommended approach… but, if you are running into problems because your site has been live and has important user information that has never been mapped, you might find this post useful.