my model doesn't move from the origin, or moves or rotates ONCE and then returns to the origin I exported my scene with a simple plane and a animated mesh into 2.73 from 2.66a and now the mesh doesn't move from the origin, it looks like if it wants to move or rotate but it remains in  the origin, or if it moves when i press another key to rotate or move, the model returns into origin. Please help

Here is the blend file:

http://www.pasteall.org/blend/33673

Perhaps this could work:

How do you import a rigged character from one blender file to another?

Now i am trying to clear parent between armature and mesh nd rig again. Actually the walking animation was easy to reproduce and not very accurate. hmmmm
Problem solved!! I linked model and armature from 2.66a, applied proxy (Ctrl+Alt+P) and rigged and animated again the mesh. All worked fine!!