FULL PRODUCT VERSION :
Java 6 Update 20

ADDITIONAL OS VERSION INFORMATION :
Windows XP Home SP3

A DESCRIPTION OF THE PROBLEM :
A stack trace occurs on new JFileChooser.

java.lang.NullPointerException
       at java.awt.image.BufferedImage.setRGB(Unknown Source)
       at sun.awt.shell.Win32ShellFolderManager2.getStandardViewButton(Unknown
Source)
       at sun.awt.shell.Win32ShellFolderManager2.get(Unknown Source)
       at sun.awt.shell.ShellFolder.get(Unknown Source)
       at com.sun.java.swing.plaf.windows.WindowsLookAndFeel$LazyWindowsIcon.cr
eateValue(Unknown Source)
       at javax.swing.UIDefaults.getFromHashtable(Unknown Source)
       at javax.swing.UIDefaults.get(Unknown Source)
       at javax.swing.MultiUIDefaults.get(Unknown Source)
       at javax.swing.UIDefaults.getIcon(Unknown Source)
       at javax.swing.UIManager.getIcon(Unknown Source)
       at javax.swing.plaf.basic.BasicFileChooserUI.installIcons(Unknown Source
)
       at javax.swing.plaf.basic.BasicFileChooserUI.installDefaults(Unknown Sou
rce)
       at javax.swing.plaf.basic.BasicFileChooserUI.installUI(Unknown Source)
       at com.sun.java.swing.plaf.windows.WindowsFileChooserUI.installUI(Unknow
n Source)
       at javax.swing.JComponent.setUI(Unknown Source)
       at javax.swing.JFileChooser.updateUI(Unknown Source)
       at javax.swing.JFileChooser.setup(Unknown Source)
       at javax.swing.JFileChooser.<init>(Unknown Source)
       at javax.swing.JFileChooser.<init>(Unknown Source)

This was reported by a customer and has just started happening, it didnt occur previously. I assuming the problem is either with Java 6 Update 20 or with a change in their hardware that has exposed an existing bug

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Unable to reproduce, just ocurring for one customer at the moment.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException

REPRODUCIBILITY :
This bug can be reproduced always.