I have this as well. I have updated the code to fix this problem. by using a timer to clear the screen elements it gets past whatever was interfering.
If you have flash to recompile my solution is below:
ADD this import to the top of the code
import flash.events.TimerEvent;
And replace the function with this...
public function replayVideo(e:MouseEvent)
{
// Reset progress bar position and play video
_progBar.width = 0;
_videoPlayback.playheadTime = 0;
_replayBkg.visible = false;
_replayGraphic.visible = false;
_videoPlayback.play();
var clearingTimer:Timer = new Timer(100, 1); // 10th of a second
clearingTimer.addEventListener(TimerEvent.TIMER, clearReplay);
clearingTimer.start();
function clearReplay(event:TimerEvent):void {
_replayBkg.visible = false;
_replayGraphic.visible = false;
}
_fullscreenBtn.mouseEnabled = true;
}