When using split/story mode, most articles from vox.com do not load

When using split/story mode most but not all articles from vox.com will not load. The story pane will be blank.

Chrome console gives the following error: 
Refused to display ‘http://www.vox.com/2015/6/24/8838383/working-mothers-impact-on-kids’ in a frame because it set ‘X-Frame-Options’ to ‘SAMEORIGIN’.common.js:129 Uncaught SecurityError: Failed to read the ‘contentDocument’ property from ‘HTMLIFrameElement’: Sandbox access violation: Blocked a frame at "http://www.newsblur.com"; from accessing a frame at “null”.  The frame being accessed is sandboxed and lacks the “allow-same-origin” flag.

Example that does not load:

Example the DOES load:



It’s just the publisher’s intention that we’ll have to respect. If they don’t want you in Story mode, Text mode is the best we can do.

Huh, that’s bizarre. You’d think they would want me to view the actual site instead of a text grab. Why do think it does work for some articles?

Good question. That content-origin policy is an HTTP header, which isn’t trivial to setup. It’s possible that only stories that go through a particular content management branch get that header while some custom stories do not. That’s my guess without diving in deep.