Full story is over at the Ultima Online Homepage.
Recently, we discovered a large number of checks for amounts over one million gold pieces. Checks were never intended to exist in denominations of more than a million. Unfortunately, these inflated checks have been used by exploiters to store extremely large amounts of gold. These checks have now been removed from the game.
This action has resulted in over 180 accounts being terminated and approximately 15 Trillion (15,000,000,000,000) gold pieces have been permanently removed from the game.