NullPointerException when trying to view Preferences

Hi All.
I've downloaded 9IJDEVELOPER WITH OA EXTENSION ARU FOR 11i10 RUP4 (Patch 5455514) and extracted to my local disk. The operating system is Windows XP Professional.
I set environment variables JDEVBIN, JDEVDOC, JDEVHOME (this one is redundant?) and JDEV_USER_HOME to point to the extracted JDeveloper folder.
Start JDeveloper and from the menu, select Tools -> Preferences, but then I get a null pointer exception. The details are,
java.lang.NullPointerException
     at oracle.ide.addin.config.AddinManagerOptions.copyToImpl(AddinManagerOptions.java:151)
     at oracle.ide.addin.config.AddinManagerOptions.copyTo(AddinManagerOptions.java:462)
     at oracle.ide.util.ModelUtil.deepCopy(ModelUtil.java:297)
     at oracle.ide.config.IdeSettings.copyToImpl(IdeSettings.java:137)
     at oracle.ide.config.IdeSettings.copyTo(IdeSettings.java:131)
     at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:313)
     at oracle.ide.config.IdeSettings.showDialog(IdeSettings.java:241)
     at oracle.ide.cmd.IdeSettingsCommand.doit(IdeSettingsCommand.java:35)
     at oracle.ide.CommandProcessor.invoke(CommandProcessor.java:363)
     at oracle.ide.CommandProcessor.invoke(CommandProcessor.java:115)
     at oracle.ide.IdeAction$1.run(IdeAction.java:614)
     at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
No other menu items suffer this problem.
I have been using JDeveloper 10g until recently, but never had any problems using both 10g and 9i before my PC was upgraded tp XP. A colleague has also extracted this JDeveloper with no problems yet we have the same software installed on PC's.
Any ideas what might be wrong? Or where to look?
Thanks.
Stu.
Edited by: stumozley on Apr 30, 2009 8:06 AM

try the OA Framework forum, or even better, Metalink (since you downloaded it from there)

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