I created a hinge constraint between 2 rigid bodies and I can't rotate the hinge axis of the constraint properly. Each body is a group of primitives. Here is what I've done:

-created 2 polygon primitives;
-grouped them (edit->group) under "group1";
-created another 2 polygon primitives;
-group them (edit->group) under "group2";
-selecting group1 I created active rigidBody1;
-selecting group2 I created active rigidBody2;
-selecting group1 and group2, created a hinge constraint;

The problem is that I can't rotate the axis of the hinge in world coordinates. Whenever I move the constraint or try to rotate it, the hinge axis move very strangely all over the place, not following the world axes. What can I do?
(I have Maya 7.0).

Thanks for your time.