I may have found a bug in calculating the drop zone positions.
I think the position of the drop zone is being calculated from the current position of the draggable, but being placed according to the original position of the draggable.
Here is an example to demonstrate this behavior. Using the /example/dragdrop/, change the #droppable to be on the right side (change CSS 'left: 5px;' to 'right: 5px;'), and change the draggables to 'revert:false;'. If you move the 1st draggable to be 10px away from the #droppable and drop it. Then drag it again and try to drop it on the droppable. It won't trigger the drop, instead, the drop zone is now 10px from the first draggables original location (not its current location).
same problem here.
I created a little drag and drop prototype to realize a 'quiz' and wondered why the "drop"-event was fired on places where no Droppable was set for.
Is there any solution to fix this wired 'jump-arround-the-screen' behaviour?