I'm running: Zope version: Zope 2.2.1 (source release, python 1.5.2, linux2) Python version: 1.5.2 Suddenly, I can't create a Zclass within any of my products. I go to Control_Panel/Products. Create a product test. Move into test. I try to Add a ZClass and get the following: ----------- Error Type: Could not load oid Error Value: None <!-- Traceback (innermost last): File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 222, in publish_module File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 187, in publish File /usr/share/zope/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 171, in publish File /usr/lib/python1.5/site-packages/ZPublisher/mapply.py, line 160, in mapply (Object: manage_addZClass) File /usr/lib/python1.5/site-packages/ZPublisher/Publish.py, line 112, in call_object (Object: manage_addZClass) File /usr/share/zope/lib/python/ZClasses/ZClass.py, line 154, in manage_addZClass (Object: Traversable) File /usr/share/zope/lib/python/OFS/ObjectManager.py, line 264, in _setObject (Object: Traversable) File /usr/share/zope/lib/python/ZClasses/ZClass.py, line 421, in manage_afterAdd (Object: fff) File /usr/share/zope/lib/python/ZClasses/ZClass.py, line 374, in _register (Object: fff) File /usr/share/zope/lib/python/ZODB/Connection.py, line 447, in setstate File /usr/share/zope/lib/python/ZODB/Connection.py, line 213, in _persistent_load (Info: \010Contentsq\021U\004helpq\022(U\004OFSPq\023U\032ObjectManager_Contents.stxq\024tq\025U\006actionq\026U\013manage_mainq\027u}q\030(h\020U\015Import/Exportq\031h\022(h\023U\037ObjectManager_Import-Export.stxq\032tq\033h\026U\027manage_importExportFormq\034utq\035U\022__ac_permissions__q\036((U\016Add zmarkTestsq\037)(U\007Managerq tq!tq"tq#U\006_p_oidq$U\010\000\000\000\000\000\000\025zq%U\011meta_typeq&U\011zmarkTestq\'U\012__module__q(U\031*Imn0C9EPqOhwmjIol0gNgQ==q)U\016propertysheetsq*U\010\000\000\000\000\000\000\025\177q+Qutq,t.N.')) Could not load oid > ------------ I seem to be able to add any other type of object. I was able to add ZClasses to my hearts content yesterday. I can't think of anything I've down between then and now that could cause this to happen. Any ideas? Thanks, Mark