Page 1 of R1 PROBLEMS ON THE WHARFEDALE 750S

I HAVE JUST EXCHANGED MY WHARFEDALE 750 FOR A 750S AT MY LOCAL TESCO. GLADIATOR DISC2 PLAYS PERFECT AS DO ALL MY OTHER R1 DISCS EXCEPT FOR JAWS. THE PICTURE IS FINE BUT I AM ONLY GETTING SOUND FROM THE FRONT SPEAKERS, NOTHING FROM BEHIND. IT WORKED FINE ON THE 750.
ANY SUGGESTIONS?
P.S. HAS ANYBODY ELSE HAD PROBLEMS WITH R1 DISCS ON THE 750S?

MGS, i say you give the Wharfedale back and get a multi region, macro disabled Pioneer DV535 from Techtronics. 180 you cant go wrong.

What have you set the digital output up as in the settings menu?