I cut my character into pieces, exported them as PNG-files,
then added bones in moho.
So i have all these rigged bodyparts scattered over the workingplace.
I did the layer-binding thing, bone-parenting and enabeled region binding, and still the images distort when i move(or rotate) them in order to get al the parts back together .
It's like if a tiny piece of the image is glued on the screen, and stretches when i try moving it.
If you are able to post your moho file (and any files it needs) we might have a better idea what is going on. In the meantime, have you tried adjusting the relative strengths of the bones?
Here's another possibility: if you applied a non-uniform (different in X and Y) layer scale to the bone layer, it can have the effect of making things appear to change shape as you move the bones around. Again, if we can see the Moho file it would help to answer the question.