Arm IK finds every handle, doesn't work though
I have a quite simple puppet, with only one view, no head turns, just the front. Just like in Dave Werners Tutorial I added Arm IK to the top level puppet. Every bodypart is found, just once, like it needs to. But it does not work. I can stretch the arms to infinity and beyond and elbows cannot change direction. Does anybody see a mistake? Where can I start my search?

