Range instrumentation problems at the Vandenberg Air Force Base space launch complex has delayed the planned August 2 launch of an Atlas 5 rocket carrying a classified payload for the National Reconnaissance Office as well as 11 cubesats from several universities and other federal agencies. Several of the cubesats will operate in the amateur radio bands.
The <www.spaceflightnow.com> website announced the delay as well as a new target launch date of September
Source: http://cqnewsroom.blogspot.com/2012/08/multi-cubesat-launch-postponed.html