Alex, could you report what the following outputs on your installation:
strings _xpcommodule.so | grep ClassInfo Tobias. The symbol _15Py_nsIClassInfo.type should appear as here: [toberste@bluebox toberste]$ strings /home/toberste/my-xpcom/mozilla/extensions/python/xpcom/src/_xpcommodule.so | grep ClassInfo GetIID__t13nsCOMTypeInfo1Z12nsIClassInfo getattr__15Py_nsIClassInfoPCc setattr__15Py_nsIClassInfoPCcP7_object PyMethods_IClassInfo GetIID__12nsIClassInfo __vt_15Py_nsIClassInfo _._15Py_nsIClassInfo _Q212nsIClassInfo25GetIID__12nsIClassInfo..0.iid Constructor__15Py_nsIClassInfoP11nsISupportsRC4nsID __15Py_nsIClassInfoP11nsISupportsRC4nsID InitType__15Py_nsIClassInfoP7_object _15Py_nsIClassInfo.type nsIClassInfo IID_nsIClassInfo IID_nsIClassInfo nsIClassInfo [toberste@bluebox toberste]$
