Hello to you all! I have a pretty confusing problem :-/ I wrote a product called GMSBericht for publishing news. I started development on zope-2.4.0, and continued working on it through 2.4.2, 2.4.3 and now 2.5.0. The product is refreshable so I don't have to restart the server when I change the python code. Somwhere in the 2.4.2 time zope started to behave strange. When I refreshed my product I was unable to create new instances of it any more. I had to restart the server to be able to create new instances of GMSBericht, until the next refresh. As you can imagin, this makes development rather painfull. When I try to create a new instance of GMSBericht after refreshing it, I get the following error message: Error Type: TypeError Error Value: object of type 'None' is not callable The traceback is: Traceback (innermost last): File /home/sven/zope-2.5.0/lib/python/ZPublisher/Publish.py, line 150, in publish_module File /home/sven/zope-2.5.0/lib/python/ZPublisher/Publish.py, line 114, in publish File /home/sven/zope-2.5.0/lib/python/Zope/__init__.py, line 158, in zpublisher_exception_hook (Object: GMS) File /home/sven/zope-2.5.0/lib/python/ZPublisher/Publish.py, line 98, in publish File /home/sven/zope-2.5.0/lib/python/ZPublisher/mapply.py, line 88, in mapply (Object: addGMSBericht) File /home/sven/zope-2.5.0/lib/python/ZPublisher/Publish.py, line 39, in call_object (Object: addGMSBericht) File /home/sven/zope-2.5.0/lib/python/Products/GMSBericht/GMSBericht.py, line 169, in addGMSBericht (Object: GMS) TypeError: (see above) Line 169 of GMSBericht.py is in the add function: def addGMSBericht(self,id,title,RESPONSE,REQUEST): """Legt ein Objekt vom Typ GMSBericht an""" handle = GMSBericht() <---This is line 169!! handle.id=id handle.title=title self._setObject(id,handle) if REQUEST.form['submit'] == 'Anlegen und editieren!': RESPONSE.redirect(id+'/editcontent') else: RESPONSE.redirect('manage_main') (Note: GMS is a folder) As you can see, this is just "standard code". And I never changed it since the first version of my product! (Note: My product never had an __init__() function, so "handle=GMSBericht()" executes no code of my own) But after switching to 2.4.2 the described problem appeared and never vanished with 2.4.3 and 2.5.0. I found an old version of my product on my first 2.4.0 installation. I started this server again and tested the behaviour after a refresh, and no error occured. After this I copied the very same source code from $OLDSERVER/lib/python/Products/GMSBericht to a new installation of zope-2.5.0 and the error described above appeared. Then I tested it the other way arround. I took the newest version of my product and copied it to my old server installation, and no error occured after a refresh of my product. Finally I made a new installation of 2.4.0, installed my product (new and old version) and tested the behaviour after "refresh" and no error occured. Unfortunately I need the new features of 2.5.0, so can't just use 2.4.0 (This wouldn't be a real solution). Has anybody encounterd the same problem, or is this a known zope bug? Can anybody help me? Thanks in advance! Greetings Sven Rudolph