Steps to reproduce:
1. Compile and run the attached testcase.

Expected results:
1. A window with "title1" shows  up. Window contains a JInternalFrame with maximize icon, "title2", iconify icon, another maximize icon and close icon all on the same horizontal line.

Actual results:
1. A window with "title1" shows up. Window contains a JInternalFrame but maximize icon is about 20 pixels below the actual title bar the JInternalFrame. "title2" and other icons are  about 300 pixels below the title bar. If you resize the JFrame you will see that "title2" is actually always in the middle of the JInternalFrame.

Testcase:
import java.awt.*;
import javax.swing.*;
public class testcase extends JFrame {
        public static void main(String[] args) {
                new testcase().show();
        }
        public testcase() {
                super("title1");
                JInternalFrame frame = new JInternalFrame("title2", true, true, true, true);
                this.setContentPane(frame);
                frame.show();
                this.setSize(new Dimension(600, 600));
        }
}