Cause symbol change from GBOED to GBOE ... nothing more nothing less... just normal stuff that goes on during those kind of times :-D http://t1.gstatic.com/images?q=tbn:ANd9GcQrK6GJjGA3hpY6_rBJFRs-Vae6yrDhgbCM6RyBiLEdmkMwRyHd-A