[CWizard]

A couple of things: 1. I did the "twist during tightening" thing suggested by Rick and also tightened the fitting a bit harder, and it does not leak anymore. 2. I agree with Jerry C. that a reference, preferably online, for AN fitting torque would be useful. So if you know of one, please post! And Fred, I suspect that your source is a vendor manual, which probably isn't going to be available online, right?
Thanks again to all who responded.
Jerry