OK,Shut off ALL the power. Unplug everything, and make sure all switches are off. Pull all of your neutrals off the bus. (Except the one from the service) Check each of them from the white wire to the bus for continuity. If you get continuity, that is your problem circuit. The ground and neut are touching each other somewhere.
[This message has been edited by electure (edited 11-14-2002).]