[_ck_]

First try switching your theme to the alternate and back again.

If that does nothing, temporarily deactivate any plugin you may be using and see if that does it.

Oh wait, you’ve been hacking at your theme.

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There’s no way that’s the default, you must have edited that.

Replace the theme files from the original.

So far it only looks like you edited front-page.php, so try replacing it with this in bb-templates/kakumei

http://svn.automattic.com/bbpress/trunk/bb-templates/kakumei/front-page.php