Facebook Reauthentification just stopped working
$dialog_url = "https://www.facebook.com/dialog/oauth?client_id="
            . $app_id . "&redirect_uri=" . urlencode($my_url)
            . '&auth_type=reauthenticate&auth_nonce=' . $auth_nonce;

https://www.facebook.com/login.php?api_key=295295517212&skip_api_login=1&display=page&cancel_url=http%3A%2F%2Fblah.com%2Fblah.do%26error_reason%3Duser_denied%26error%3Daccess_denied%26error_description%3DThe%2Buser%2Bdenied%2Byour%2Brequest.&fbconnect=1&next=https%3A%2F%2Fwww.facebook.com%2Fdialog%2Foauth%3F_path%3Dpermissions.request%26app_id%3D295295517212%26redirect_uri%3Dhttp%253A%252F%252Fblah.com%252Fblah%252Fblah.do%26display%3Dpage%26response_type%3Dcode%26auth_type%3Dreauthenticate%26auth_nonce%3Djldk%26fbconnect%3D1%26from_login%3D1%26client_id%3D295295517212&rcount=1&skipcookie=1&oauth_reauthenticate=1&oauth_nonce=jldk