Bug: Geocoding reference data with Z values generates geocoding results with null geometries; does not display results
When using a geocoding service created with reference data that has Z or M values to geocode addresses, the geocoding results contain a null geometry value. They do not display in ArcMap or in the preview pane of ArcCatalog.
This is a known issue.
This was not an issue with ArcView 3.X and is no longer an issue with ArcGIS 9.x release. To resolve the issue, upgrade to an ArcGIS 9.x release.