SetIkPosition mecanim offset error

After some time the ik position is offset from the point, the final position is offset in y more and more with past of time , the parent of the character is no scaled ( like said in others questions) . I have some animations , I think the animations are doing something with the character because, when I disable the animation transition , It works correct.

I have tested with the unity3D example , exporting to ipad mini ., the ik move upside with the time as you can see in the image.
What I am doing wrong, ?

I think this is a bug in Unity 3D, still waiting for some help.

Good news, at least for me… I’ve managed to make the problem go away by swapping out the animator controller every minute or so, when my game allows a convenient place for doing the swap. I believe this is a precision error of the mobile device since I never see this happen on the PC.

I just reference a different controller in script using:
var runtimeAnimatorController : RuntimeAnimatorController

then swap using:
Animator.runtimeAnimatorController

Edit:
I supposed you can even swap to a copy of the original controller, to keep things simple, but I’m not sure what happens to memory, I mean if all new clips are put in RAM or not.
Also, were you able to get a bug report submitted? If I have time I will try to send in something, but time is hard to find right now.