I don't have my Poser here, but I suspect that the "point at" function would rotate the actor so that its "twist" axis points toward the object. That's fine for arms and legs and - theoretically - eyes, but in the case of the head, the twist axis is the vertical axis. It has to be, or posing the head wouldn't work correctly. So I'd actually expect the behaviour you are seeing. The best we can probably do is create some dummy prop or actor that we can point at things properly and then slave the head to that.

Another thing to take into account is that "point at" uses the coordinate origin, not the actual center, of the target object as its reference point. You see that pretty clearly when you point a camera at - say - a forearm. I'd have to check where the origin is for cameras in order to see whether there's a chance at all that "point at" would work correctly with them. At any rate, my recommendation would be to place a small, properly centered prop - say the default cube prop scaled to some appropriate size - in the scene and use it as the object to point at. You could, for example, parent it to the camera and make sure it's in the center of the view.

-- I'm not mad at you, just Westphalian.