I'm getting an error in CMFCore.utils in the _mergedLocalRoles function. The error is: Exception Type TypeError Exception Value can only concatenate tuple (not "list") to tuple I modify utils.py, after saving a copy, in order to obtain diagnostic output. Then I delete utils.pyc, after saving a copy, in order to force a recompile (even used compilezpy.py for this a couple of times). Zope never seems to use the new version. Also, I added comments ahead of the line where the error occurs so that the line number should be higher than the original error line number. But, it's always the same. I suspect that I have a fundamental misunderstanding of how Zope uses code in the Products directory. Is Zope storing all the compiled byte code in the data.fs file? Is there a way to force Zope to use new code? Also, the previous developer removed the Control Panel putting Plone as the root of everything. How can I get information that the Control Panel usually provides? System: Zope 2.7.1, Plone 2.0.5, Python 2.3.4, Red Hat 7.2 Thank you. Barry Drake The traceback: Traceback (innermost last): Module ZPublisher.Publish, line 101, in publish Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module Products.CMFFormController.ControllerPageTemplate, line 80, in __call__ Module Products.CMFFormController.BaseControllerPageTemplate, line 39, in _call Module Products.CMFFormController.ControllerBase, line 243, in getNext Module Products.CMFFormController.Actions.TraverseTo, line 36, in __call__ Module ZPublisher.mapply, line 88, in mapply Module ZPublisher.Publish, line 39, in call_object Module Products.CMFFormController.ControllerPythonScript, line 159, in __call__ Module Shared.DC.Scripts.Bindings, line 306, in __call__ Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec Module Products.PythonScripts.PythonScript, line 323, in _exec Module None, line 19, in pag_edit - <ControllerPythonScript at /Plone/pag_edit used for /Plone/Members/bldrake/privLinks.pag> - Line 19 Module Products.CMFDefault.Document, line 192, in edit Module Products.CMFCore.CMFCatalogAware, line 69, in reindexObject Module Products.CMFCore.CatalogTool, line 262, in reindexObject Module Products.CMFCore.CatalogTool, line 235, in catalog_object Module Products.ZCatalog.ZCatalog, line 528, in catalog_object Module Products.ZCatalog.Catalog, line 381, in catalogObject Module Products.PluginIndexes.common.UnIndex, line 240, in index_object Module Products.PluginIndexes.KeywordIndex.KeywordIndex, line 61, in _index_object Module Products.PluginIndexes.KeywordIndex.KeywordIndex, line 94, in _get_object_keywords Module Products.CMFCore.CatalogTool, line 63, in allowedRolesAndUsers THE FOLLOWING ERROR SHOULD BE ON LINE 216 NOW, BUT HASN'T MOVED FROM THE ORIGINAL. Module Products.CMFCore.utils, line 215, in _mergedLocalRoles TypeError: can only concatenate tuple (not "list") to tuple