Feeds render nothing following addition of a new feed

Adding a new feed has now twice caused all non-blurblog feeds to render nothing when selected.

* Added a new feed using the green + button in the bottom left corner. (This one was http://www.startuplessonslearned.com/).
* When finished, the feed (in Feed view) appeared blank. Story view is also blank; original pulls in the site.
* Clicking around, all other non-blurblog feeds also appeared blank.
* Blurblogs are seemingly unaffected.

Here are two screenshots; one of the feed as blank and one of a blurblog showing up as expected:

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Err, I’m not sure about this. I can’t reproduce it for the life of me. Does this happen every time? What’s the browser?