You can also program the 1DX to allow you to move the auto focus point by simply pressing the joy stick sideways or vertical. There is no need to press any other buttons. I have mine set this way and love it.
Yep - and as Rich stated above, he's got that setting enabled (as do I).
The issue he's talking about is that when the metering timer shuts off (which is after 6-7 seconds), you can look through the VF and see the selected AF point, but moving the multicontroller does nothing. You must half-press the shutter or press the AF-ON button, which re-engages metering, and also re-activates AF point selection.
There's a C.Fn to set the metering time out for Live View shooting, but I don't see one to extend the metering timing for VF shooting.
Hmm, not sure I have noticed if the timeout had occurred or not. I'll give that a try and see. Maybe I just half press the shutter from muscle memory due to all of these years of half pressing the shutter button.