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I spotted this bug recently, on a forum where I installed the plugin. When a User performs the SSO for the first time, he gets redirected to a page asking for a password. Before he can type the password, though, Js Auto SignIn fires again, displaying the "logging you to the forum" box, then redirecting the user back to the same page. This becomes an infinite loop, unless the User is lightning fast in typing the password and submitting it.