Hi! I have objects in my product which shouldn't be accessed simultaneously by different threads. So I mixed their class in the Sync.Synchronized class as recommended in http://www.zope.org/Documentation/How-To/ThreadSafety. But now I can't even create the objects because of UnpickleableError: Traceback (innermost last): File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 223, in publish_module File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/lib/zope/lib/python/Zope/__init__.py, line 226, in zpublisher_exception_hook File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 175, in publish File /usr/lib/zope/lib/python/Zope/__init__.py, line 240, in commit File /usr/lib/zope/lib/python/ZODB/Transaction.py, line 302, in commit File /usr/lib/zope/lib/python/ZODB/Connection.py, line 418, in commit (Info: (('Products.Tap3Editor.tap3editor', 'tap3editor'), '\x00\x00\x00\x00\x00\x00j\x08', '')) UnpickleableError: (see above) I use zope 2.4.2 for linux from debian binary distribution. So could someone explain what's the problem here? -- Best regards, Alexei