I keep seeing qz.com linked here: Is there a bloody reason that the page doesn't go completely to the right side, so I can use my bloody mousewheel without my mouse being over the content?
At browser widths of about 1400px and above, a buffer appears on the right hand side of the page. If your cursor is in that area the main content div won't scroll.
I'm thinking it may be an error since the main content div stops expanding at about 1400px but the black header/nav does. At widths lower than 1400px the header and content div expand/shrink together and the scrolling problem does not occur since the content div fills the full width of the page to right.
I can see how the responsiveness would work well on mobile devices, but it's painful to discover content on the site via a laptop. The content itself is OK since you have a fixed width.
TL;DR - The website is very difficult to enjoy because of the design.
Sorry for not getting to you faster.