Unity 4 mecanim animation bug

Hi everybody,
i have one problem with my character in Unity 4 and with animation “walk”… if i set in the “Rig panel” Humanoid character and i configure it, in the animation my character is distorted… so… my character has a strange hump. Auto-rotate the neck probably.

The image:

thanks a lot.

edit: problem solved.

Bye bye.