Earlier today, NewsBlur was not marking stores as read (the normal interaction I expect is the titles are bold until I scroll past them, where they go unbold and marked as read") on my Lifehacker feed (http://feeds.gawker.com/lifehacker/vip).
I hit the Home button and then hit refresh in my browser. When it came back, Lifehacker was missing completely. I refreshed again and then wiped my browser’s cache to no joy, the feed was gone.
I checked the site organizer tool as well as the mute site tool and it was not listed there either. I did not receive the usual automated email from Newsblur with a backup of my feeds as if it was removed by my choice.
I readded the feed manually and it loaded without issue. Just thought I would make you aware as that could be a potentially painful bug.
If it matters, Chrome v 40.0.2214.93 m, not using any visual style or script that should interfere with NewsBlur (other than Ghostery and AdBlock)