It's not just you, I'm getting the same error as a user to GQueues. It is when trying to authenticate using the Google Apps account.
I'm guessing "unscheduled maintenance" -- 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-appeng...@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.