It seems the web app at google sometimes gets confused, when you are logged in to more than one (google) account at a time.
You log in OK (authentication), but when you are trying to access the GAE page (authorization) I think the webapp somehow does that with the wrong cookie. For me it worked to use another browser / delete all cookies related to google, and then try again. If this tip was written on the "authorization denied" page, I could have saved an hour of pulling out my hair :-) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.