Same here.
I did not stop for any time at all. Clicked in the block with available seats, clicked two together in the back row, moved my cursor to the buy button and the red 'tickets unavailable' message was already displayed.
Repeated three times.
He doesn't mean people who tried to select them BEFORE 9.00am.
He means (and he's dead right) that it is completely shit that you could log in legitimately, select your AVAILABLE seats AFTER 9.00am, but when you click 'BUY' they are then 'unavailable'.
Odds were always against being successful...