I recall somewhere reading that point at doesn't work with the default camera - that may be why it works sometimes and sometimes not. Typically though, having the eyes point at the camera will give a slight cross eyed effect (i think you can manually adjust the parameters to remove the crossed eyes).

My cheat is a little more complex, but usable. I usually put two small spheres in the scene, parent them together, place them where I want the eyes to look. I then use point at with one eye looking at each sphere. I simply adjust the  sphere separation to address the crossed eyes syndrom. This also makes it easier to have the eyes focus anywhere in the scene you want.

Not a super simple solution, but workable. Hope it helps.

__________________________________________________________

My Rendo Gallery ........ My DAZ3D Gallery ........... My DA Gallery ......