Could you review the situation with next test case:
http://ipg-jets.us.oracle.com/JavaFX/javafx-drafts/2.0/drag_drop/hellodraganddrop.zip

There is a code:
source.setOnDragDone(new EventHandler <DragEvent>() {
            public void handle(DragEvent event) {
                /* the drag-and-drop gesture ended */
                System.out.println("onDragDone");
                /* if the data was successfully moved, clear it */
                if (event.getTransferMode() == TransferMode.MOVE) { //Here
                    source.setText("");
                }
                
                event.consume();
            }
        });

On windows Transfer mode is Move, and on Mac - Copy. Is everything right here?