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Elbow 180 Flip Issue

Hello,

I’m trying to figure out how to make animations and have run into a problem that I would like to understand.
Here’s a short clip to demonstrate the issue:
https://drive.google.com/open?id=0B0eV5r9stGxaMHpFR2ZSaS1BVkE

Basically, I adjust the hand position a little bit and the elbow will flip 180 degrees.
I’ve tried pinning the elbows rotation.
Any idea what would cause that?

Thank you.