I would suggest trying 2.2 beta 4. I think that all of the multi-arg append()'s are out of that

Not quite. I currently found 3 events. I will send apropriate patches to Collector today. I promise that will check all of Zope sources for append() incompatibility (without non-standard Products of course :). Maybe for socket.connect() too. Adam Karpierz karpierz@alpha.pl