V6 II can't change power of Nikon speedlights.
I've just got a pair of V6 IIs and set them up this morning - one on the camera and one on an SB-800. However, when I tried them out they would fire the speedlight but I can't change the power. I dial in a different power on the transmitter and it shows a different value but it doesn't change on the receiver.
Any ideas how to fix this?