mouseMove() does not work after calling of Dragboard.setContent(). Sample to reproduce:

import com.sun.glass.ui.Robot;
import java.util.concurrent.CountDownLatch;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.Dragboard;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.TransferMode;
import javafx.stage.Stage;

public class ImitateDrag extends Application {

    public static void main(String[] args) {
        launch(args);
    }

    public static final int BEFORE_DRAG_TIMEOUT = 500;
    public static final int BEFORE_DROP_TIMEOUT = 500;
    public static final int IN_DRAG_TIMEOUT = 20;
    public static final int DND_POINTS = 10;

    public void dnd(int x1, int y1, int x2, int y2) throws InterruptedException {
        final Robot robot = com.sun.glass.ui.Application.GetApplication().createRobot();
        robot.mouseMove(x1, y1);
        robot.mousePress(1);
        Thread.sleep(BEFORE_DRAG_TIMEOUT);
        int xDistance = x2 - x1;
        int yDistance = y2 - y1;
        for (int i = 0; i < DND_POINTS + 1; i++) {
            final int x = x1 + xDistance * i / DND_POINTS;
            final int y = y1 + yDistance * i / DND_POINTS;
            final CountDownLatch l = new CountDownLatch(1);
            Platform.runLater(new Runnable() {
                public void run() {
                    robot.mouseMove(x, y);
                    l.countDown();
                }
            });
            l.await();
            Thread.sleep(IN_DRAG_TIMEOUT);
        }
        robot.mouseMove(x2, y2);
        Thread.sleep(BEFORE_DROP_TIMEOUT);
        robot.mouseRelease(1);
    }

    @Override
    public void start(final Stage stage) {
        final Label l = new Label("label");
        l.setOnDragDetected(new EventHandler<MouseEvent>() {

            public void handle(MouseEvent event) {
                final Dragboard db = l.startDragAndDrop(TransferMode.ANY);
                final ClipboardContent content = new ClipboardContent();
                content.putString(l.getClass().getSimpleName());
                db.setContent(content);
                event.consume();
            }
        });
        final Scene scene = new Scene(new Group(l), 300, 300);
        stage.setScene(scene);
        stage.show();

        new Thread() {

            @Override
            public void run() {
                try {
                    dnd((int) stage.getX() + 30, (int) stage.getY() + 40, (int) stage.getX() + 230, (int) stage.getY() + 240);
                } catch (InterruptedException ex) {
                    Logger.getLogger(ImitateDrag.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        }.start();
    }
}