Crash when selecting "tools - preferences"

Question

Hello all,
Hope I'm not repeating a question here - I did a search and couldn't find a similar question.
After moving from Windows 98 to XP, I'm getting a crash in JDeveloper when selecting "tools -> preferences" (the call chain is attached below). Can anyone help?
All I need to do is to switch off the highlighting of the current line and the bracket matching - failing a fix for the crash, can this be configured in one of the setup files?
Many thanks,
Rich.
(call chain):
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)
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Answer 1

Have you down loaded any extensions to your jdev/lib/ext directory?