Note that I found another bug with the suggestion above: creating a second DragDrop element messes with detecting dropping events on it, hence never validating its wait command. So instead of creating two DragDrop elements, one should create and reuse a single one:
newDragDrop("dragdrop")
.addDrag(getImage("bear"))
.addDrop(getCanvas("flowerCV"))
.wait()
.removeDrag(getImage("bear"))
.removeDrop(getCanvas("flowerCV"))
,
// ...
getDragDrop("dragdrop")
.addDrag(getCanvas("flowerCV"))
.addDrop(getCanvas("boxCV"))
.wait()
Jeremy