Hello all I first saw this error while hitting cancel at the HTTP Authentication pop-up window (where the username and password are requested) of one of my Zope applications: You are not authorized to access this resouce Username and password are not correct (Also, an error occurred while attempting to render the standard error message.) The first two lines are OK, but I have been unable to find out what is causing the "...rendering the standard_error_message." message. I have seen the same "rendering error" on some other "errors", even with tracebacks (which I, normally, got none in my example above) posted on the net by others, still I have no explanation of it and how to fix it. This message started appearing just after an upgrade from 2.5.1 to 2.6.0. All the applications seem to run fine -so far- within the new 2.6.0 In my start-up script I am passing a -L es_MX (to use locales) to the z2.py script. I am running on Red Hat Linux 7.3 with binaries install of Zope 2.6.0 Anyone willing to explain what is is rendering error message about and how to fix it. Thanks in advance. Edward.