Brisbane:There was one glaring mis-step from Ben Stokes which cost England a wicket on the second morning of the Ashes, giving Australian opener David Warner a reprieve when he was on 17.
It soon emerged that Stokes, bowling his first over in a test match since March, had also overstepped the crease on his previous three deliveries and not been called for a no-ball by the umpires.
Later still, Australia's Ashes broadcaster Channel 7 revealed Stokes had overstepped the front crease 14 times in Thursdays' opening session and had only been called twice for a no-ball.
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The missed opportunity on Warner was a problem for Stokes and England. The amended decision: no ball. Warner got to play on. One run was added to the total in the sundries column and an extra delivery had to be bowled in the over.
But it exposed a bigger problem for the match officials.
Cricket Australia said a technology problem at the Gabba meant that the third umpire, Paul Wilson, couldn't review TV replays of every delivery to check if bowlers were over-stepping the crease, leaving it to the on-field umpires to make the calls.