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Can't reproduce. "java.lang.InternalError: HTHEME is null at sun.awt.windows.ThemeReader.paintBackground(Native Method) at sun.awt.windows.ThemeReader.paintBackground(ThemeReader.java:64) at com.sun.java.swing.plaf.windows.XPStyle$SkinPainter.paintToImage(XPStyle.java:561) at sun.swing.CachedPainter.paint0(CachedPainter.java:131) at sun.swing.CachedPainter.paint(CachedPainter.java:96) at com.sun.java.swing.plaf.windows.XPStyle$Skin.paintSkin(XPStyle.java:535) at com.sun.java.swing.plaf.windows.WindowsButtonUI.paintXPButtonBackground(WindowsButtonUI.java:218) at com.sun.java.swing.plaf.windows.WindowsButtonUI.paint(WindowsButtonUI.java:144) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:142) at javax.swing.JComponent.paintComponent(JComponent.java:743) at javax.swing.JComponent.paint(JComponent.java:1006) at javax.swing.JComponent.paintChildren(JComponent.java:843) at javax.swing.JComponent.paint(JComponent.java:1015) at javax.swing.JComponent.paintChildren(JComponent.java:843) at javax.swing.JComponent.paint(JComponent.java:1015) at javax.swing.JComponent.paintChildren(JComponent.java:843) at javax.swing.JComponent.paint(JComponent.java:1015) at javax.swing.JComponent.paintChildren(JComponent.java:843) at javax.swing.JComponent.paint(JComponent.java:1015) at javax.swing.JLayeredPane.paint(JLayeredPane.java:559) at javax.swing.JComponent.paintChildren(JComponent.java:843) at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4979) at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4925) at javax.swing.JComponent.paint(JComponent.java:996) at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21) at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60) at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97) at java.awt.Container.paint(Container.java:1709) at javax.swing.JDialog.update(JDialog.java:484) at sun.awt.RepaintArea.updateComponent(RepaintArea.java:239) at sun.awt.RepaintArea.paint(RepaintArea.java:216) at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:254) at java.awt.Component.dispatchEventImpl(Component.java:4044) at java.awt.Container.dispatchEventImpl(Container.java:2024) at java.awt.Window.dispatchEventImpl(Window.java:1778) at java.awt.Component.dispatchEvent(Component.java:3803) at java.awt.EventQueue.dispatchEvent(EventQueue.java:463) at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149) at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)"
what Theme on Windows do you use? Did you resize screen size or maybe connected a monitor? Please reopen with more info. It looks as JDK bug 6588271