An unrelated bug that seems to have shipped today: you can reliably deny an iOS user access to the Gmail mobile Web application in Safari and also the iOS Gmail application if you send them an e-mail which (1) ends up in their inbox and (2) has an attached .ics calendar invitation. They'll be forcibly logged out & redirected to the auth screen once they load their inbox in mobile view if their inbox contains a message with an .ics invitation file.

On the flip side, if you see this behavior, you can log in, search for [in:inbox .ics], select all the results, and choose "archive". Neat bug.