D300 Dynamic Area Focus question

[InsuredDisaster]

So I'm looking at my D300 and I almost always use the single point AF setting. But I'm interested in the Dynamic Area. Except I can't get it to work. If I do the 51 3D, I can move the camera around and the focus point jumps around. I also tried the 9,21 and 51 non 3D options but the sensor does not move around, change focus as I move the subject around.
I'm using a Nikon 50 1.4 lens and the focus mode is set to Continous servo.
Could anyone tell me what the problem is?

[Harryb]

Have you checked to see if you focus selecor lock is set to lock?

[InsuredDisaster]

I've locked it so that my nose does not move the sensor around.

[RayLarson]

I've locked it so that my nose does not move the sensor around.
Didn't your mother ever tell you.."Don't stick you nose where it don't belong"?

:ivar