if skeleton is visible and not moving that means you indeed might have problem with usb bandwidth.
but there is also possible although chance is small, that there is bug in application and it does not refresh skeleton.
to check this you need to download SDK and run skeleton/body tracking sample.
in the same time you need disable body tracking in driver4vr.
that will make kinect working but not from driver but external sampel application.
then need to look if it keeps on tracking skeleton in this external ap