No Connection window and no object browser - also getting java exceptions

Ok, something's whacked - SQL Developer was working just fine on my Win XP sp2 system until I rebooted. Now, when I run SQL Developer there is no Connections window. When I do select View->Connections it does nothing.
The only way I can connect is File->New then select Database Connection. Once there I can see the list of the database connections I was using so I select one and log in no problem.
However, once connected all I get is the SQL Worksheet - there is no Object Browser!
Also, in the Tools->Preferences if I select Code Editor or Database Connections or Debugger etc etc (not everything mind you) I get an error dialog. Pressing 'Details' gives me this...
java.lang.NullPointerException
     at oracle.jdevimpl.runner.debug.DebugWindowSettingsPanel.onExit(DebugWindowSettingsPanel.java:223)
     at oracle.ide.panels.MDDPanel.exitTraversable(MDDPanel.java:977)
     at oracle.ide.panels.MDDPanel.mav$exitTraversable(MDDPanel.java)
     at oracle.ide.panels.MDDPanel$Tsl.updateSelectedNavigable(MDDPanel.java:1272)
     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:268)
     at oracle.ide.controller.IdeAction.performAction(IdeAction.java:552)
     at oracle.ide.controller.IdeAction$1.run(IdeAction.java:785)
     at oracle.ide.controller.IdeAction.actionPerformedImpl(IdeAction.java:804)
     at oracle.ide.controller.IdeAction.actionPerformed(IdeAction.java:499)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
     at javax.swing.AbstractButton$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)
Like I said, this ran before just fine before my reboot.
I've tried rebooting again and that didn't solve anything.
I've tried reinstalling it and that didn't solve anything.
I'm running out of ideas as to what might be wrong - anyone ?

Hmmm... ok... I downloaded it again and reinstalled and now it works - ah... ok...
I did do one thing different however - I removed the old directory rather than just unzipping over top of it like I did last time (but I did ask it to overwrite).
The only thing I can think of is a corrupted configuration file or something.
Whatever, it works now - sorry to have trouble anyone.

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