Hi Thorsten,
I don't know about Mapsource, but this is how the Garmin GPSMap 62s behaves. It is looking for the nearest "road", whatever this is, and tries to route from that. If this "nearest road" is not connected, you will get a routing error.
I know about this. There is some distance range form current position, where should be a routable road to begin a routing. Maybe the same distance limit is in effect for point addressing, but it doesn't explain total failure of Gerd's new function in Mapsource. I can only repeat, Mapsource doesn't behave that way, see the picture, that I have attached some mails ago. This is exactly the same case, a road created between 2 address points on short non-routable artificial roads. The only difference is that map is created with cgpsmapper. Maybe new code still creates routable ways for address points? It could lead to straight routes, if road network is discontinuous. -- Best regards, Andrzej