Orkut sessions automatically time out after a few hours. Also, our system occasionally experiences a glitch and redirects you to a sign-in page. If you see "session expired", click your browser's back button to continue your Orkut session.
If you're unable to return to your Orkut session, you'll need to sign in again. We realize that you may occasionally lose messages you were in the middle of creating, and we're sorry about this inconvenience.