Our traffic jumped up by 20% on October 9, but looking back at the data I really don't think we were penalized by the first ATF algo on Janary 19 - our traffic was down about 10% on the 19, 20 and 21, but then back to normal the week after, until panda 3.5.
Is it possible there's also a positive boost effect?
1 to 2 weeks before this update we actually changed our layout a bit - widening the site from 700 to 750px, and shortening from 151 to 135px the image header that runs across the entire top of the page, which framed the logo. Apart from that, after 200px of h1 and utility links, we have the content with the nav on the left. We have no ads at all on the entire site, except for a CTA below the nav for our social stuff.
Food for thought?