We're looking into reports that some players were unable to access games using discs as expected during the service interruption, Scott Van Vliet said in a statement. He said the outage, which lasted around 20 hours, was caused by a licensing issue failing to correctly check if a user was allowed to play a game. It has poured further fuel onto the fire of fears about gaming's potentially digital future after Xbox rival PlayStation faced an outage of its own on Friday . Disc based...