There it is!

Hi Elliott, thanks for your answer

But the Easy Slider fullwidth element works perfectly, as you can see at the beginning of the content area. With only that full-width element (no full-width masonry image gallery), the sidebar is working as it should.

The masonry image gallery element triggers an empty div just before the #footer div and there’s no <aside> tag to put the sidebar in, and no sidebar content in the code neither. This sidebar comes partly from the theme’s setting (navigation links) and a search form that I set in the widget area, so no workaround possible for now.

Just to be sure that’s the way you guys meant it to be and not that it’s not a bug.