[Mark44]

@jim and linda, it sounds like what worked for you was similar to what I suggested, in that disconnecting the battery allowed the window mechanism to reset so that it "knew" where it should stop.
Sometimes I think the Porsche engineers are too clever by half, but considering that they make cars that are capable of speeds up to 200 mph, I guess they wanted the windows to seal tightly against the door gasket, but at the same time, not wear out that gasket in opening and closing.