"due to a Broker placing an order to sell 200 BILLION shares of Procter & Gamble instead of 200 million shares!"

And how does one place an order of 200 billion shares when they don't exist? My account kicks that sort of error back. How does one sell what they don't have in their account, or in the case of shorting, what is in the brokers account, particularly on that scale? Ohhhhhh someone should be asking questions about a system that says that kind of thing is possible.