In the main, responsive adsense ads seem to work well with the responsive layout but I have come across one consistent bug with the "Just below page header" zone on Google Chrome. The bug seems to be something to to with the 979px breakpoint (when the hamburger menu appears). When the viewport is less than 979px, the ad appears as it should but above 979px, the ad does not appear at all. The ad displays as expected on other browsers.

Just logged this as a bug.