Sillytone,
I'm really not sure, but maybe it means your animation has twist bones for the arms and they stand horizontal without moving instead of following the arms. Or something about this. Without checking everything, I cannot guess better...
rharm2,
this is because the torso, shoulder & arm proportions differ between the 2 players, and thus the hands end in slightly different relative positions.
I did a little system to force the 2nd hand on the handles and racket strings, but when it's somewhere else, it cannot help. (ie: the CalculateOffHandPositioning buttons)
So the only way to fix that at 100% is to reposition the hands on the TE4 bones after have transferred the TE3 animation to it. It's relatively easy to do in 3DS Max and likely can be done in ~20 min per animation, but with other software, I don't know.
If you'd like to try, I can write a little tutorial to do so.
