[Zope] Product->refresh broken in zope-2.4.3?

Hello all! After "refreshing" my product I can't create new instances of my product any more. I get the following error message: 'Object of type "None" is not callable' This happens even if I didn't change anything in my source code. Just clicking the "refresh" button is enough. When I restart the sever everything works fine again. This behaviour is new in zope-2.4.3 (I updated from 2.4.1) Is this a known bug? Must I downgrade again to 2.4.1? Thanks in advance Sven -- Sven Rudolph GermanMedicalServices.de GmbH Unter den Eichen 5, 65195 Wiesbaden Tel.: 06 11 / 97 46 25 2