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Hmmm, I just got mine yesterday and I can not get them to fire consistently. In fact it appears that the only time the off-camera will fire is when the IR sensor side is turned toward the Master on-camera. This is why I'm asking, I wonder if anyone is actually using the same combo, D4, on-camera SB900 and off-camera SB900.
On-camera SB900 is set to Ch1 and GrA and set to Master. The transmitter is also set to Ch1 and GrA. Off-camera is set to remote, Ch1 and GrA and so is the receiver. The Off-camera is set to Manual mode before switching to Remote.
I was having the same exact problem with two pairs of yn622n. Could not get them to work consistently even in the office/studio. Kept digging around on the YN website and it appears that they have never tested them with D3, D3s or D4 so they will not confirm that they work with their gear. So I was wondering the same about these units.