If you are going to update your D4 with the new Distortion Control Data file (Ver. 1.009) make sure your network connection setting is off. I wasted a few hours this morning first trying to install the update myself, then spending an hour with a “first- level” Nikon tech who had to put me on hold for every question she asked me. She finally moved me onto a real tech, who immediately asked if the network connection was on and to turn it off for the updating. Problem solved!