With MP activated the sidebar disappears from a Thesis 2.x skin.
Also, the map (set to 100% width) does not resize properly. While it always resizes, the width is often less than 50% of the available screen width on mobile devices (I use responsinator.com for testing).
With the default WP Twenty-twelve theme, all is well. The sidebar is present and responsive resizing of the map and sidebar is as expected.
So far, Genesis works as expected, too.
Has anyone else seen this with Thesis 2 or am I hallucinating?