Hi All, Apologies for the cross post, but this problem is occurring with a repoze.bfg app running on apache using mod_wsgi, and the exception is suggesting something zope.interface related... So, firstly, it only happens intermittently, and I haven't been able to figure out any pattern to the exceptions. It didn't used to happen at all (this app has been happily running for a year or so now) but I can't think of anything that's changed on the machine in question that might cause this. Restarting Apache does appear to cure it for a bit... The exception is as follows: File "aircon/bin/mod_wsgi", line 34, in <module> from aircon.web import make_app File "aircon/aircon/web.py", line 2, in <module> from aircon.config import system,Session File "aircon/aircon/config.py", line 1, in <module> from gb50 import System File "aircon/aircon/gb50.py", line 33, in <module> class System: File "zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/advice.py", line 141, in advise return callback(newClass) File "zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py", line 471, in _implements_advice classImplements(cls, *interfaces) File "zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py", line 447, in classImplements spec = implementedBy(cls) File "zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/declarations.py", line 287, in implementedByFallback spec = cls.__dict__.get('__implemented__') 2011] [error] [client 93.89.128.162] RuntimeError: class.__dict__ not accessible in restricted mode the section of gb50.py looks like: from aircon.interfaces import ISystem,IUnit from zope.interface import implements class System: implements(ISystem) ... The interface is: from zope.interface import Interface,Attribute class ISystem(Interface): ... Anyone seen anything like this before or have any ideas? cheers, Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk