FULL PRODUCT VERSION :
java version "1.6.0_10-beta"
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b14)
Java HotSpot(TM) Client VM (build 11.0-b11, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
When using the DefaultMetalTheme for painting an vertical disabled filled JSlider the track will be painted wrong.
Reason is probably a copy/paste error in
javax.swing.plaf.metalMetalSliderUI.paintTrack()
Line 300:
    g.fillRect( fillLeft, fillTop, fillRight - fillLeft, trackBottom - trackTop );
should be
    g.fillRect( fillLeft, fillTop, fillRight - fillLeft, fillBottom - fillTop );

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a UI with DefaultMetalTheme
and add a vertical JSlider which is disabled and filled:
  slider.setEnabled(false);
  slider.putClientProperty("JSlider.isFilled", true);
The filled track of the Slider is painted wrong, especially if it is set to inverted.



REPRODUCIBILITY :
This bug can be reproduced rarely.

---------- BEGIN SOURCE ----------
/**
 * This class shows a JFram with 4 vertical sliders:
 * enabled + bottom-up
 * enabled + top-down
 * disabled + bottom-up
 * disabled + top-down
 * The enabled Sliders where painted correctly the disabled not.
 */
public class SliderTest {

public static void main(String[] args)
{
JPanel panel = new JPanel(new FlowLayout());
panel.add(createSlider(true, true, true, false));
panel.add(createSlider(true, true, true, true));
panel.add(createSlider(true, false, true, false));
panel.add(createSlider(true, false, true, true));
MetalLookAndFeel.setCurrentTheme(new DefaultMetalTheme());
JFrame frame = new JFrame("Window Title");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(panel);
frame.pack();
frame.setVisible(true);
}

private static JSlider createSlider(boolean vertical, boolean disabled, boolean filled, boolean inverted)
{
JSlider slider = new JSlider(vertical? SwingConstants.VERTICAL : SwingConstants.HORIZONTAL, 10, 30, 20);
if (!disabled)
slider.setEnabled(false);
if (filled)
slider.putClientProperty("JSlider.isFilled", true);
if (inverted)
slider.setInverted(true);
return slider;
}
}
---------- END SOURCE ----------