Yeah thats weird idk why mine wouldn't work on either of my computers but I wasn't using quick reboot. Can you try get into cwm from the fastboot menu and see if it works? I would like to see if its a widespread issue. I would say wait to add the line until you know it is widespread issue but if it won't hurt anything then what the hell...if you haven't already.
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Sent from my Nexus 7 using Tapatalk 2