So I know how to do it. Press the WB button and move the dial to Pre, then use the sub-dial to move it to d-1, d-2, d-3, or d-4. Then let go and Hold down the WB button a couple seconds until it blinks and shoot a gray-card.
It's worked in the past but for some reason now it will never blink PRE so it won't shoot the WB. I can get it to work only by taking a picture of the gray-card, then navigating the menus and assigning a pic to a WB preset.
I don't have bracketing or HDR or Active D-Lighting enabled and it's set to single shot P. I've tried manual and autofocus, nothing seems to work.
Is my D800 bugged or is there some setting I'm overlooking? I've tried removing and replacing the battery and it doesn't help.