Hi! i have a problem with my animated model … i have bad english and cant explain it, then i make video, please look at it 
Is the parents scale 1.00? (ALT+S).
yeah, i check evrything, EVRYTHING! … hmm, mabye bone constraints? is supported in BGE? i have rotation limit and IK on the foots and legs
Oh, that may be the problem, I don’t know that they work in the GE. Only a few constraints work (I don’t know which). I’m sure someone will be able to help you here. 
It looks like you have a problem with the constraints. Avoid the usage of world coordinates.
ou, thanks for answer Monster, but what do you mean with this? i dont understand you with my bad english, can you explain it little more?
p.s. i have a lot of experience with animating, but this has never happened to me
I think Monster means re-rig him.
With NO constraints.
why? i always using constraints … thats may be “hard work” without const.
What I mean is this:
Your contraints run in world space rather than in object (pose space) or bone space (local space).
You should see that when you turn your armature around Z-axis even in Blender.
I suggest to follow some of the walk-cycle video tutorials.
Thanks! i look at this … btw. i see many walk-cycle tutorials, but i never see the first set-up of armature