[larrydavid]

It's a responsive issue, not sure if it's intentional or not.

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.