It is both bitterly cold here and exceptionally humid, normally over 80%. Glad I'm not the only one. I don't even try closing the door with the window up, usually with the door open if I give it a quick shake grabbing the top of the window, that will free it up. If not the putty knife does it. Just kinda hoped there was a fix for it, it's not like Germany is exactly a tropical country that this sort of this shouldn't have been considered or addressed.