All of a sudden this is happening. I have a transceiver on my camera and the receiver on the quantum. The receiver works on my canon 580 flash just fine but when I move it to the quantum I get nothing. I got a new sync cord in case that was the problem but it wasn't. I have factory reset both cactus. The quantum flash is firing fine on it's own and the two cactus' are "talking" to each other so I know the batteries are fine. I have tried switching to group B on both instead of group A. Any other ideas? Thanks!