I'm starting out on the creation kit tutorial, and just moving pieces around. When moving and dragging, I can constrain movement to the x and z directions (by holding down x or z, respectively) but when I try to constrain movement to Y, it doesn't work. Instead, it seems the viewpoint moves around different angles in the render window - it toggles between left view, front view, top view, free view, etc.
I searched on constrain movement and found nothing. Anyone know what is going on?