Sun 13-Jan-13 02:31 AM | edited Sun 13-Jan-13 02:48 AM by M_Jackson
The SB800 and SB900-910 IR ports are on the SIDE of the strobe, next to the battery door. It is the dark little circle and not the wide red plastic element on the front of the strobe. This might not be the problem here, but it is important to point the IR port back towards the Commander unit.
I just did a quick test with a SB800. Commander D800 in-camera, Channel 1, Group A