RALEIGH, (SGRToday.com) - We've all had it happen on our personal computers, and now the FAA says a glitch with a software upgrade could be the cause of the grounding of hundreds of flights on the East Coast Saturday.

Flights at North Carolina airports were among those impacted.

The FAA's Facebook page contained the following posting on Sunday.

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FAA air traffic has operated normally today. The FAA is continuing to work with airlines that may still be repositioning airplanes and crew members.

The FAA is focusing on a recent software upgrade at a high-altitude radar facility in Leesburg, VA as the possible source of yesterday's automation problems. The upgrade was designed to provide additional tools for controllers. The FAA has disabled the new features while the agency and its system contractor completes their assessment. There is no indication that the problem is related to any inherent problems with the En Route Automation Modernization system, which has had a greater than 99.99 availability rate since it was completed nationwide earlier this year.