Couple of things come to mind. 

1. Check the Body Y-coordinate data. It should read 0.000 at all times. If it doesn't, then there's your problem. 

2. Try a different camera. If you changed the orientation of the Main camera at any time, and you use it to view your animation, that'll cause it, too.

3. Depending on where it is, even out either the Y or Z levels in the Hip. That's where all your up and down movement should be anyway. If she's on her back, it'll be the Z axis, if upright, the Y-axis. Only adujst this in small increments, though.

4. Zero your figure before starting. This is something I should have put in the tutorial, but didn't think of at the time. Window->Joint Editor. There's a button that says Zero figure. Hit that with the IK off, and she'll drop to the floor with her feet flat.

In the Tutorial, I Y-translated her at the hip so her boots wouldn't poke through. Everything went smoothly for me, but that doesn't mean the poses match up exactly, either, since they were actually made for two different animations.

If you save the animation and pack up either a .pz2 file of your .pz3 (unclothed, untextured figures only, please), I can have a look.

The only other thing I can think of would be during the running phase, you picked up her whole body rather than just her trailing foot. I can't be certain without some more details, though.

That's just the things that come to mind. If you decide to pack up the .pz2(just like saving a pose, except you do it as a multi-frame animation), you can email me at the address at the very end, after my Be Nice rant.

:lol:

I'm going to get off my soapbox now, and let you get back to your day