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I'm making a rig from this tutorial: http://vimeo.com/30078317
And i have problem like this:
As the title says and GIF shows it is probably a problem with IK, but i don't know how to fix it.
Move your pole-target bone in front of the knee, when you've done the setup as in the tutorial at 19:30 this should work. The IK solver tries to maintain the orientation of the knee to the pole target. That is the reason why the leg is winding .
Required, but never shown