Using the Brave browser (https://brave.com/) if you follow a link to Blizzard Watch (http://blizzardwatch.com/) from Newsblur, two things happen.
First, a new tab opens in the foreground with “An unexpected error has occurred”. If you click the “Retry URL” button that Brave shows, the page opens properly.
Second, the NewsBlur tab itself changes to “Error”. There also you can retry the URL and NewsBlur will reappear properly.
This is probably not a high priority issue, but perhaps you could have a look?