I should note it works fine for me, but several webmasters are saying that when they run it, it returns a red X and says "failure."
John Mueller from Google responded to the thread saying:
We're looking into this and should have some feedback for you guys soon. Thanks for your patience.
This does not seem to be an issue with every site but only a select number. How large that number is, is the big question.
So just a heads up that if the fetch as GoogleBot tool doesn't work for you, you are not alone.
Forum discussion at Google Webmaster Help.