the packing that should be placed at the bottom corner near the lower hinge and the packing that goes opposite it in the top corner on the closing side has moved and allowed the door to go out of shape and no longer be square,EG one measurment from corner to corner is greater than before and the other is now less.
the packing is hidden behind the edge beading. the glass is used to keep the door square, with the aid of the plastic packing strips. they need adjusting again.
Mike
April 2010