This is reproducible with 6u10 b29 pit build. Reproducible on Windows XP Professional.

A blocked Frame comes on top of a blocking Dialog when the Frame's security warning icon is clicked. This is a regression after the new security warning implementation.

To reproduce, run the below test as 'java -Djava.security.manager ModalityBug' and click on Frame's security warning icon.

import java.awt.*;

public class ModalityBug {
    
    public static void main(String[] args) {
        Frame f = new Frame("Test frame");
        f.setSize(200, 200);
        f.setLocation(100, 100);
        
        Dialog d = new Dialog(new Frame(), "Modal dialog");
        d.setSize(200, 200);
        d.setLocation(140, 140);
        d.setModal(true);
        
        f.setVisible(true);
        d.setVisible(true);
    }
}