In Firefox and IE, I'm seeing this bug on all main SE front pages:
docsHero.RenderPartial(Html); storyHero.RenderPartial(Html); on the top of the front page.
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Rolled back to the previous build, then double, triple and quadruple checking the view. Still looking at what happened, but basically, it's a banner that isn't always shown, so I didn't see it and it doesn't always show for everyone. Sorry about that!
– Michael Stum♦
So everything is fixed now. Yay! :P