Ok, so I’m trying to use CoreLocation in a mono mac app. After a few attempts at getting it to work with no luck (the .UpdatedLocation event is never raised), I grabbed this sample from the MonoMac repository.
The configuration/use of the CLLocationManager seems pretty straightforward:
locationManager = new CLLocationManager();
locationManager.UpdatedLocation += HandleLocationManagerUpdatedLocation;
locationManager.Failed += HandleLocationManagerFailed;
locationManager.StartUpdatingLocation();
Unfortunately, it seems the results were the same there as the location is never shown:

So is there some sort of setting on the mac that I need to enable for this to work? CLLocationManager.LocationServicesEnabled is returning true when I check it at runtime.
On Mountain Lion I see the same issue that Joel is seeing. The update never occurs. I created a sample obj-c app and that does work. In the console log I see these errors with the MonoMac app:
But for the obj-c app it looks like:
I have not determined the cause.