Hi all, It appears that even though you can delete the title property from a folder you cannot add it again. I came across this when trying to debug a duplicate property id error. Say you have called this python script from the current folder: #Delete all existing properties context.manage_delProperties(context.propertyIds()) You can then check the current folder "Properties" and indeed the title property is no longer listed. However you can't add it again: context.manage_addProperty('title', 'test property value', 'string') return This error results: Error Type: Bad Request Error Value: Invalid or duplicate property id Unfortunately I am no longer able to add a title property using the Zope management interface either. Interim workaround seems to be: never delete a folder's title property. How do people suggest I recreate the folder titles that have already been 'deleted'? BTW I've run fstest.py and the Zope database is still fine. Thanks, Adam