Mysterious NAB pay glitch fixed

NAB is remaining tight-lipped about the exact cause of yesterday's software error that delayed payments to thousands of businesses and employees.

The "software error" that occurred at NAB yesterday caused a major hiccup in the bank's systems which route pay to retail and business customers paid through NAB's systems.

"It was a software error, a technical glitch and it was rectified straight away," an NAB spokesperson told ZDNet.com.au today.

Although the error was fixed immediately, the stoppage caused a massive backlog that the bank processed throughout the day, according to the spokesperson.

NAB has not clarified the exact software glitch that occurred or which of its systems were at the centre of the error.

"We're conducting further investigations. Our top priority was getting the payments through," they said.

The bank is also remaining quiet on how many customers were put out by the error, but confirmed that both business and retail customers were affected.