Java Development Tools

Hi,
I'm running JDev 10g preview (9.0.5.0 build 1375) on windows 2000.
I've just encountered a startup problem which locks JDev as it opens a modal dialog box titled "Connecting".
The dialog box is not painting properly (everything apart from the frame is grey) nor is JDev. Both the dialog box & JDev in the background sit there grey & doing nothing.

The dialog is not responding to user input, so I can't close the dialog box & can't use JDev either - I have to kill it via Windows Task Manager.

When I run the jdev.exe, the background console window has the following error msg:

java.lang.ClassCastException: oracle.ds.v2.jds.addins.XhtmlWizard
at oracle.ide.AddinManager.initializeAddin(AddinManager.java:1707)
at oracle.ide.AddinManager.initializeAddins(AddinManager.java:1565)
at oracle.ide.AddinManager.initProductAndUserAddins(AddinManager.java:47
9)
at oracle.ide.IdeCore.initProductAndUserAddins(IdeCore.java:1721)
at oracle.ide.IdeCore.startupImpl(IdeCore.java:1201)
at oracle.ide.Ide.startup(Ide.java:2159)
at oracle.jdeveloper.JDeveloper.launch(JDeveloper.java:58)
at oracle.jdeveloper.JDeveloper.main(JDeveloper.java:37)

I've looked in jdev.conf for the addin but can't find a reference to it. Nor is there any reference to this addin in any of the conf files under /jdev/bin. I've done a search on the entire JDeveloper directory on my machine for text containing XhtmlWizard but explorer reports nothing found.

Any suggestions other than a clean install (& will this mean I'll have to rebuild all my project library references?).

Cheers,
Deadline chasing Eddie!