The locker is locked all the time until you're coasting, and in a turn.
mudonthetires probably has a chattering clutch that he's attributing to the locker.
Also with my locker, if I am in a parking lot with the steering wheel turned all the way to one direction and the clutch pressed down coasting pretty slowly, the locker will want to hop some. It will feel like its catching, then releasing, catching, then releasing, until I get out of the turn. Does this sound about right too?