java.util.ConcurrentModificationException
	at java.util.Hashtable$Enumerator.next(Unknown Source)
	at java.util.AbstractCollection.addAll(Unknown Source)
	at java.util.HashSet.<init>(Unknown Source)
	at com.sun.java.swing.plaf.nimbus.NimbusStyle.compileDefaults(Unknown Source)
	at com.sun.java.swing.plaf.nimbus.NimbusStyle.validate(Unknown Source)
	at com.sun.java.swing.plaf.nimbus.NimbusStyle.getValues(Unknown Source)
	at com.sun.java.swing.plaf.nimbus.NimbusStyle.getInsets(Unknown Source)
	at javax.swing.plaf.synth.SynthStyle.installDefaults(Unknown Source)
	at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(Unknown Source)
	at javax.swing.plaf.synth.SynthRootPaneUI.updateStyle(Unknown Source)
	at javax.swing.plaf.synth.SynthRootPaneUI.installDefaults(Unknown Source)
	at javax.swing.plaf.basic.BasicRootPaneUI.installUI(Unknown Source)
	at javax.swing.JComponent.setUI(Unknown Source)
	at javax.swing.JRootPane.setUI(Unknown Source)
	at javax.swing.JRootPane.updateUI(Unknown Source)
	at javax.swing.JRootPane.<init>(Unknown Source)
	at javax.swing.JFrame.createRootPane(Unknown Source)
	at javax.swing.JFrame.frameInit(Unknown Source)
	at javax.swing.JFrame.<init>(Unknown Source)
	at org.netbeans.core.windows.view.ui.MainWindow.<init>(MainWindow.java:104)
	at org.netbeans.core.windows.view.ViewHierarchy.getMainWindow(ViewHierarchy.java:124)
	at org.netbeans.core.windows.view.DefaultView.getMainWindow(DefaultView.java:100)
	at org.netbeans.core.windows.ViewRequestor.getMainWindow(ViewRequestor.java:102)
	at org.netbeans.core.windows.Central.getMainWindow(Central.java:1791)
	at org.netbeans.core.windows.WindowManagerImpl.getMainWindow(WindowManagerImpl.java:159)
	at org.netbeans.core.windows.actions.ToggleFullScreenAction.isEnabled(ToggleFullScreenAction.java:134)
	at javax.swing.AbstractAction.setEnabledFromAction(Unknown Source)
	at javax.swing.AbstractButton.configurePropertiesFromAction(Unknown Source)
	at javax.swing.JMenuItem.configurePropertiesFromAction(Unknown Source)
	at javax.swing.AbstractButton.setAction(Unknown Source)
	at javax.swing.JCheckBoxMenuItem.<init>(Unknown Source)
	at org.netbeans.core.windows.actions.ToggleFullScreenAction.createItems(ToggleFullScreenAction.java:112)
	at org.netbeans.core.windows.actions.ToggleFullScreenAction.access$100(ToggleFullScreenAction.java:66)
	at org.netbeans.core.windows.actions.ToggleFullScreenAction$1.propertyChange(ToggleFullScreenAction.java:77)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at java.beans.PropertyChangeSupport.firePropertyChange(Unknown Source)
	at org.openide.util.SharedClassObject.firePropertyChange(SharedClassObject.java:454)
	at org.openide.util.SharedClassObject.putProperty(SharedClassObject.java:329)
	at org.openide.util.actions.SystemAction.putValue(SystemAction.java:158)
[catch] at org.netbeans.core.NbKeymap$1.run(NbKeymap.java:297)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:104)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)