Way to fix Mecanim retargeting errors?

Unity Engine
1

After retargeting a walk cycle animation from one rig to another I’m seeing some small errors.

The left leg becomes hyper-extended and the ankle rotation is offset so the foot isn’t flat with the ground:

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If I toggle off the IK button in the Preview the hyper-extension goes away but the ankle rotation remains:

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When I change the Muscle constraints for Left Leg → Foot Up-Down from -50-50 to -180-180 and leave the IK button turned off, the foot is flat with the ground

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If I toggle IK back on, the hyper-extension and ankle rotation returns

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Regardless of my settings, the IK seems to be turned on for my character in the engine because the hyper extension and ankle rotation is present:

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Anyone know how I can get rid of the hyper-extension and ankle rotation for my character? What is the IK button doing exactly and is there a way to turn this on/off for my character in the engine?

Thanks,
Brad

2

I solved the IK question by:

  1. Open Animator window
  2. Select the State or Blend Tree for the animation in question.
  3. In the Inpector toggle off “Foot IK”

However, I still have some minor hyper-extension for both legs on my character in the engine that is not in the animation on the original skeleton. Is there a way to correct this error? I’m using 4.0.1f2, maybe there are fixes in 4.1?