I use PIL to create on-the-fly icons for my python product. So in my product __init__, instead of ImageFile icons, I create Image icons. Everything seems fine, but when I try to use it, I get a login dialog and, on cancel: Unauthorized You are not authorized to access this resource. Username and password are not correct. Traceback (innermost last): File C:\PROGRA~1\Zope\lib\python\ZPublisher\Publish.py, line 150, in publish_module File C:\PROGRA~1\Zope\lib\python\ZPublisher\Publish.py, line 114, in publish File C:\PROGRA~1\Zope\lib\python\ZPublisher\Publish.py, line 89, in publish File C:\PROGRA~1\Zope\lib\python\ZPublisher\BaseRequest.py, line 404, in traverse File C:\PROGRA~1\Zope\lib\python\ZPublisher\HTTPResponse.py, line 511, in unauthorized Unauthorized: (see above) It seems that it's a security problem... Any clues?