Can't use the broker or mail ATM in game (USPC hero side) and seems like lots having same issue. When you open the broker nothing shows up and "Internal Broker Error" shows up. Same thing if you try to sell anything or do anything else. Internal Broker Error. Opening your mail causes a similar problem. Error=34 "An error occured while retrieving your mail. Try again later."
It's their way of stabilizing the economy. Wipe out all the money on the broker so people have less. Just kidding, I don't know whats going on.