I don't think it was meant that you had changed/modified the camera's name.  It's just that sometimes Poser doesn't realise that you have switched cameras, and it draws the focus control gizmo from a different camera than the one you think you should be affecting (the one you are seeing the view from).  Example would be parameters pallette saying "face" though you have switched to dolly via the icon.  You will see the dolly camera's view, but adjusting the focus is actually still affecting the face camera.  Sometimes you can even see it happening, when the line of sight of the two cameras intersect.