So out of the box Aurora/Corona subtheme on empty D7 site. I go to Page Manager and add a new page. Walking through the wizard, when I get to the point where I've selected the HTML5 Sections layout and I'm determining the sections/regions, I can't seem to add new sections or regions. Also, unlike the Flexible Layout, there is no helper boundary (which isn't necessary, but might be a little more helpful from a UI perspective). In any case, am I doing something wrong here? Could you write a little documentation walking a user through the creation of a very basic HTML5 Section-based layout, maybe a 3-section layout? I'd love to also get a better understanding of how I would use Singularity/Aurora to take advantage of Panels, as opposed to Panels getting in the way.