First, if the regulator is bad then it's a Jayco warranty issue, which should be taken to an authorized Jayco service center, not to the regulator manufacturer.
Second, I would check your operating procedures. What I didn't quite see you say is that you flipped the regulator's selector over to the second tank when the first one went dry. That would make the second tank the primary, and will allow you to pull the first tank out to be refilled without shutting off your gas. In general, when a tank runs dry you should always flip the selector to point to the active tank and then go refill the empty. I always check my gas tank status every couple of days, that way I don't get rude surprises in the middle of the night.
If this procedure does not work then you probably have a regulator problem.
Third, Bassdogs may have hit the nail on the head - you could just be frozen.
Good luck!
Roger