jQuery draggable problem in IE7

jQuery draggable is not calculating the scrollbar position when
dragging items.
Its easy to reproduce the problem by inserting a lot (a hundred, for
example) of

Test

paragraphs before the <div class="block"></
div> in the example code located in:
http://docs.jquery.com/UI/Draggables
and trying to drag the box.
In Firefox works fine, but in IE7 the box will disappear and fly to
the top of the page. Is this problem already known? Is there any
solution to it?