[GeneralDiscussion]

thanks - just to add - I haven't added anything significant - at the time it seemed to break I was working on a script to allow users to change passwords and I can't see anything else that has changed.  I've rolled things back to before I thought the problem occurred with no effect.  I tried to roll back further but got a page of error messages (sorry didn't capture these) and Zope now displays that there are no undos available.  Everything else in Zope seems to be working ok.  The error from google looks similar - although I wasn't using plone as was the case then.
  
I'll have to leave it for tonight but will investigate further tomorrow  - thanks John

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