Logo won't redirect to front page

A few months ago, @wpyogi was kind enough to help me with getting my site’s logo to redirect to the front page (the titled Who are we). So when you click that logo at the top of whatever page you are on, you would be returned to the Who are we page.

It quit doing that today after I switched the Url sda-seattle.org to point to my new site’s content. All that seems to be working correctly now, but the logo at the top of the page, when you click on it, you get a 404 error message. I can’t get it to work again.

My site is sda-seattle.org