Hmmm... I also shoot with a D1X and have never experienced this problem. Would like to know all the settings and tech specs that were involved.
Here is an image from Rolando's first Philly Workshop. Wish I could go again this year but it just isn't in the budget.
Model is Hillary
Cam is D1X
Lens Nikon 28-70f2.8 AF -S
Lighting Dyna-lite
shot at f8 and 1/250 sync speed. ISO set to 125