Due to the first time maritime operation at sea, the heating system of the LOX-valve was without power for longer than expected. Due to this, the LOX-valve might have been jammed by exposure to LOX-cooling. However, the rocket has not yet been examined, so additional reasons may be revealed later, if we find anothe reason to the LOX-valve failure..
LAUNCH ABORTED AND POSTPONED TO JUNE 2011
Images and video from Launch attemp Sep 5, 2010
Rocket being fueled at sea click here
Downlink video feed from the rocket click here
Tycho Brahe attitude on the launch platform click here
Images from mission control click here
Images from Nautilus and Sputnik/rocket click here