I have the Mamiya version of this lens, not the Phase One D, but in the NON LS versions, they are the same, and I believe the same even in the LS version. No I don't believe anything should be me moving around. This lens is a beast, heavy and solid. More than likely part of the focus gearing or motor has broken if you are not seeing anything in the lens.
Mine with a DF+ hit on usually the 1st time, my older DF needed the 1,2 3 hits on the shutter release. But I am not working in studio and my subject matter is usually a long way off when using this lens.
Hope the dealer steps up and takes it back, and you don't get into the shipping company damage finger pointing issues that I have been working around lately.
One other point, this lens needs to have the latest firmware installed in the lens to get the best AF. The dealer should have updated it but you might have them check. The Firmware has to be updated via a DF+ with a V grip installed and there is a way to have the DF or DF+ or what ever camera body show the lens firmware, I just can't remember how.
Paul Caldwell