BUG: JQuery UI - Sortables FF3

Found a bug in Jquery UI 1.5.2 - sortables in FireFox 3.
When using sortables with sortable (connectWith:) it does not seem to
detect when blocks with images are dragged. You can drop them at the
end but they do not cause the normal movement of the other children.
I'm guessing its to do with the image dragging provided in FF3.