"A trader on the floor of the exchange in lower Manhattan, who spoke on the condition of anonymity, said that after the suspension began, traders were told that the problem was related to updated software that was rolled out before markets opened on Wednesday.
According to the trader, the exchange said that the new software caused problems soon after trading began on Wednesday and the exchange decided to shut down trading all together to fix the problem.
A representative for the exchange did not respond to a request for comment on the trader’s account."
"A trader on the floor of the exchange in lower Manhattan, who spoke on the condition of anonymity, said that after the suspension began, traders were told that the problem was related to updated software that was rolled out before markets opened on Wednesday.
According to the trader, the exchange said that the new software caused problems soon after trading began on Wednesday and the exchange decided to shut down trading all together to fix the problem.
A representative for the exchange did not respond to a request for comment on the trader’s account."
http://www.nytimes.com/2015/07/09/business/dealbook/new-york...