Testin on mobile device. We are using the login via Twitter. We redirect user to Twitter, user logins and authorize the Application, After it user must ne redirected to our site, but instead of it he is redirected to the twitter application to the @sessions profile which does not exist.
Thanks for the report, we are aware of this issue and we are investigating. See https://dev.twitter.com/discussions/32930 for more.
We believe this issue is now resolved.