The hip works differently with IK on than with IK off.

Moving the BODY actor moves the entire figure regardless of IK setting.

With Poser 5 the Body actor did not get saved, with Poser 7 its an option when saving poses.  If the body actor has translations the figure will move to those coordinates when th pose is applied.

General pose rules is leave the body actor alone , zeroed, and use Hip instead.