A report of trading problems rippled across traders' screens Wednesday morning, causing confusion in the busy moments after the market opened regarding the status of New York Stock Exchange.

Starting at about 9:40 a.m., messages posted on Twitter referred to a picture of what appeared to be a notice to traders about trading problems. The Reuters newswire ran a headline at 9:58 a.m. that said stocks whose symbols begin with "R" through "Y" were unavailable for trading at the NYSE.

A spokesman for NYSE Euronext (NYX), the Big Board's parent, told The Wall Street Journal that, contrary to reports, the NYSE was functioning normally. And the exchange operator sent a notice to customers, at 10:01 a.m. EST, with the same message.

Reuters later published an article that noted the NYSE said its systems were functioning normally. A Reuters spokeswoman didn't immediately respond to requests for comment.

An image posted on the financial and economic blog ZeroHedge.com and elsewhere contained an image with the text, "Stocks beginning with symbols R through Y at the NYSE are currently unavailable for trading" under the heading "Interactive Brokers Bulletin Board."

The Zero Hedge post didn't say the NYSE was having problems, but referred to the bulletin-board image, a representative of the site said via email in response to a request for comment.

Interactive Brokers Group Inc. (IBKR), a U.S. brokerage, runs an online trading site and alerts customers to problems in its own systems and at exchanges. It also runs an online discussion forum that "allows IB customers to share ideas, ask other IB customers questions, and post programming code," according to its website. An Interactive Brokers spokeswoman declined to comment on the episode or confirm the authenticity of the bulletin-board notice.

The episode follows high-profile glitches that have plagued trading over the past year and drawn scrutiny to exchanges' operations. But several traders said Wednesday morning they weren't rattled by the faulty reports, which didn't show up on computer systems they use to monitor status alerts from exchanges.

"Honestly, when I got the message saying that there isn't a problem, I didn't even know there was a problem in the first place," said Jonathan Corpina, senior managing partner at Meridian Equity Partners, a NYSE member firm.

Write to Matt Jarzemsky at matthew.jarzemsky@dowjones.com

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