I work on Poser 7 on WinXp and it happend already a few times before, but I don't know how to fix it.

PLEASE look at the picture and you know what I mean....

When I posed V3 (with a pose without any morphs or so) (and no bodypart is locked and IK is OFF), when I then try to move her hand ... it happens like you can see on the screenshot. ...
Total distortion of her hand and fingers. Its like they are sticking to her leg.

And the same happend to me already a few times with V3 feet and legs and arms.

So what is wrong and how can I fix?