Platform: Windows/Solaris
JDK: 7, 8

The following method:
http://download.oracle.com/javase/7/docs/api/java/awt/Window.html#setLocationByPlatform%28boolean%29

Says:

"Calls to setVisible, setLocation and setBounds after calling setLocationByPlatform clear this property of the Window."

However this is not satisfied for calls setVisible(false)
Please see the following code sample:

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import java.awt.*;

public class ClearPropertySetVisibleFalse {

    public static void main(String[] args) {
        final Window w = new Window((Frame)null);
        w.setLocationByPlatform(true);
        w.setVisible(false);
        System.out.println("isLocationByPlatform() = " + w.isLocationByPlatform());
    }
}
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The output will be

isLocationByPlatform() = true