http://www.spaceflightnow.com/falcon9/010/140623delay/#.U6o71LGSCog
SpaceX has not disclosed any information on the problem, but sources said the issue was with the Falcon 9 launcher. A report by CBS News, citing an unnamed source, said the problem may be an engine actuator used to steer the Falcon 9 rocket in flight.
It was a success
http://www.jpl.nasa.gov/m/news/news.php?release=2014-214#.U7SULdBlCSw
Orbiting Carbon Observatory-2 Lifts Off!