Hi, I didn't find a bug on launchpad (didn't search _very_ hard), but I also don't have a recent zope at hand to verify this problem is still there. That's also the reason I didn't consider filing a bug. Zope Version (Zope 2.10.3-final, python 2.4.4, openbsd4) Python Version 2.4.4 (#1, Aug 15 2007, 13:27:05) [GCC 3.3.5 (propolice) When instantiating a BrowserView (perhaps also elsewhere) if I refer to an inexistant key on request, creation of the view fails silently; the user gets a NotFound, which is ignored by default. sample code (test.py): from zope.app.publisher.browser import BrowserView #from Products.Five.browser import BrowserView # no difference class A(BrowserView): def __init__(self, context, request): self.request = request self.context = context dummy = self.request.garbage def __call__(self): return 'Foo' configure.zcml: <browser:page for="*" class=".test.A" permission="zope2.View" name="a" /> error: Traceback (innermost last): Module ZPublisher.Publish, line 110, in publish Module ZPublisher.BaseRequest, line 498, in traverse Module ZPublisher.HTTPResponse, line 671, in debugError NotFound: <h2>Site Error</h2> <p>An error was encountered while publishing this resource. </p> <p><strong>Debugging Notice</strong></p> Zope has encountered a problem publishing your object.<p> Cannot locate object at: http://127.0.0.1:8087/a</p> I searched almost a day for a silly typo :-) regards, knitti