Jdeveloper 10134 not showing Application Navigator,Connection Navigator etc

Hi All,
I am using Jdev 10.1.3.4. When I am openning jdev I can only see "Structure" and "Property inspector". Apart form these two I am unable to open the other window i.e. "Application Navigator", "Connection Navigator" , "Component Palette" etc. I tried to open from the menu View > Application Navigator, but it didn't work.
I went to Tools > Preferences and then got the below error.
java.lang.NullPointerException
     at oracle.ideimpl.webbrowser.BrowserOptionsPanel.onEntry(BrowserOptionsPanel.java:95)
     at oracle.ide.panels.MDDPanel.enterTraversableImpl(MDDPanel.java:926)
     at oracle.ide.panels.MDDPanel.enterTraversable(MDDPanel.java:899)
     at oracle.ide.panels.MDDPanel.mav$enterTraversable(MDDPanel.java:106)
     at oracle.ide.panels.MDDPanel$Tsl.updateSelectedNavigable(MDDPanel.java:1348)
     at oracle.ide.panels.MDDPanel$Tsl.updateSelection(MDDPanel.java:1216)
     at oracle.ide.panels.MDDPanel$Tsl.actionPerformed(MDDPanel.java:1210)
     at javax.swing.Timer.fireActionPerformed(Timer.java:271)
     at javax.swing.Timer$DoPostEvent.run(Timer.java:201)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)
     at java.awt.Dialog$1.run(Dialog.java:515)
     at java.awt.Dialog.show(Dialog.java:536)
     at java.awt.Component.show(Component.java:1300)
     at java.awt.Component.setVisible(Component.java:1253)
     at oracle.bali.ewt.dialog.JEWTDialog.runDialog(Unknown Source)
     at oracle.bali.ewt.dialog.JEWTDialog.runDialog(Unknown Source)
     at oracle.ide.dialogs.WizardLauncher.runDialog(WizardLauncher.java:55)
     at oracle.ide.panels.TDialogLauncher.showDialog(TDialogLauncher.java:276)
     at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:597)
     at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:391)
     at oracle.ide.cmd.IdeSettingsCommand.doit(IdeSettingsCommand.java:47)
     at oracle.ide.controller.CommandProcessor.invoke(CommandProcessor.java:259)
     at oracle.ide.controller.IdeAction.performAction(IdeAction.java:541)
     at oracle.ide.controller.IdeAction$1.run(IdeAction.java:772)
     at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:789)
     at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:498)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.AbstractButton.doClick(AbstractButton.java:302)
     at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)
     at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)
     at java.awt.Component.processMouseEvent(Component.java:5488)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
     at java.awt.Component.processEvent(Component.java:5253)
     at java.awt.Container.processEvent(Container.java:1966)
     at java.awt.Component.dispatchEventImpl(Component.java:3955)
     at java.awt.Container.dispatchEventImpl(Container.java:2024)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
     at java.awt.Container.dispatchEventImpl(Container.java:2010)
     at java.awt.Window.dispatchEventImpl(Window.java:1774)
     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)
FYI, it was working fine previously. May be some file got missed. Can any body help me regarding this. Any help will be appreciated.
~Abhijit

Hello Frank,
Thanks for your reply. As you suggested I renamed the "system" folder within jdev folder. Then restarted jdev. But the same problem still exist.
I also tried by taking another Jdeveloper dump (which is working in another machine) , but got the same problem again in my machine.
I don't know whether the problem is with jdev files or some thing else, could be my machile system files also. Pls have a look on this once again.
~Abhijit

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