As of about 24 hours ago I also started having this issue. I have found no response from B&N support on any of their forums although many customers are reporting the issue. I guess if this is not resolved soon I'll be asking for a refund for all the books I have purchased but have not downloaded to read yet. My Kindle app works fine so I have other options for book purchases. B&N only offers email and chat support for the Android app and their chat support is currently not accessible due to "long response delay".