By Jacob Bunge, Bradley Hope and Leslie Josephs 

CHICAGO-- CME Group Inc. on Tuesday halted electronic trading in some of its most popular agricultural contracts due to technical problems, sparking chaos among brokers forced to revert quickly to manual trading, a practice made nearly obsolete by the automation of markets.

Futures and options trading in corn, wheat, live cattle and other contracts were halted shortly before 2 p.m. EDT, according to the exchange company, which said it resolved the issue about two hours later. CME said in a notice it would cancel certain types of orders while others would stand. In a second message, the exchange said its ethanol futures and options markets were also halted.

Mike Hall, president of Litchfield, Ill., brokerage MLH Futures, said he noticed the problem on his computer screen when he tried to change an order he had already placed for corn contracts and saw the market wasn't moving. He picked up the phone and dialed corn brokers in CME's Chicago pits, something he said he rarely does anymore.

"If we didn't have the floor to go to, it would have shut everything down" in those contracts, said Mr. Hall, whose firm is located in southern Illinois.

CME trades an average 1.1 million agricultural commodity contracts a day, representing about 8% of all contracts traded on its markets, the bulk of which are financial derivatives. CME is the biggest futures exchange operator in the world in terms of contracts traded and is the biggest exchange company in terms of valuation.

Tuesday's freeze-up left farmers, grain elevators and investment managers unable to electronically buy or sell some benchmark derivatives contracts that are used to help price key agricultural commodities around the world.

Brokers resorted to phoning orders into CME's Chicago trading pits, where the surge of trading suddenly made some pits busier than they had been in years, and left traders unable to accommodate all the incoming orders, brokers said.

All of the grain futures and options would be settled Tuesday through CME's manual, open outcry system that has largely been supplanted by electronic screen trading. About 8.5% of all contracts traded on CME's markets last month were transacted through open-outcry trading, the company said last week.

"Everything went crazy," said Danny Manns, a clerk in the cattle futures pit with brokerage Kenai Capital Management. "Everyone in the S&P [futures pit] came over and watched us. It was like 'the Brady Bunch,' everyone was watching us from the stairway."

The shutdown prompted market participants with offices near the trading floor-but who typically place trades electronically-to flood the grain pits to complete trades.

"It was chaos," said Todd Thielmann, an independent broker on the CBOT floor. "Guys were coming down out of their offices and the pits filled up real fast. The desk personnel were running orders--I turned down several orders. Everyone realized I was doing them a favor--most of these orders go to the screen, so for us to take their orders shows how we were able to turn it back on like in the old days."

The technical issues at CME, which operates benchmark markets that help traders and companies world-wide price grain and other commodities, are the latest in a spate of system problems that have snarled trading in U.S. stocks and derivatives markets in recent years.

Amid the temporary change to open outcry, some traders worried the move would strain the system.

Sterling Smith, a futures specialist at Citigroup in Chicago, said, "It is like if you were flying a 747 and you threw it in reverse. All the volume comes through the box (electronically), the alternative is the pit. The pit isn't really equipped to handle this sudden explosion. For people who actually have to get something done, it could cause some aggravations," he said, referring to producers and dealers of commodities who need to hedge their supplies.

Tony C. Dreibus, Kelsey Gee and Alexandra Wexler contributed to this article.

Write to Jacob Bunge at jacob.bunge@wsj.com, Bradley Hope at bradley.hope@wsj.com and Leslie Josephs at leslie.josephs@wsj.com

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