Hmmm. That newsblur URL is accepted, but even when I set the view to all, nothing shows up in the feed, even when I click “Insta-fetch stories”.
Edit: when I encounter the feed “naturally” (e.g. after marking a previous feed as all read, so then NewsBlur loads the next feed with unread articles), it loads fine. Strange, but that’s how I almost always browse, so that’s fine.