FULL PRODUCT VERSION :
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

A DESCRIPTION OF THE PROBLEM :
setLocationRelativeTo() positions a dialog at (0,0) if its Frame parent is iconified.

jdk 1.4.2_08 positions the dialog correctly
jdk 1.5.0_06 positions it at (0,0)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
test class writes to System.out:
java.awt.Point[x=150,y=150]
ACTUAL -
test class writes to System.out:
java.awt.Point[x=0,y=0]

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Dialog;
import java.awt.Frame;

public class TestSetLocationRelativeTo {

  public static void main(String[] args) {
    Frame f = new Frame("test");
    f.setBounds(100, 100, 200, 200);
    f.setVisible(true);
    f.setExtendedState(Frame.ICONIFIED);
    Dialog dlg = new Dialog(f);
    dlg.setSize(100, 100);
    dlg.setLocationRelativeTo(f);
    dlg.setVisible(true);
    // results:
    // 1.4.2_08: java.awt.Point[x=150,y=150]
    // 1.5.0_06: java.awt.Point[x=0,y=0]
    System.out.println(dlg.getLocation());
  }
}

---------- END SOURCE ----------