I'm one world emerald. Booked a return flight on B737 between KUL and Penang. I was able to choose row 5 (just behind biz) for myself and the wife noting though that on both sides of the aircraft, it seems row 5b and 5e (the middle seats) are blocked out or occupied (which I doubt as the aeroplane is wide open and flight is not until October). So we just took 5a and 5c. Odd though how 5b and 5e on both sectors blocked out?