I have always gotten a message and spinning ball saying the library is being updated. I contacted NSTA help and they forwarded all of my data (iOS version, iPad version, memory available, wifi speed, etc.) to the app developer, who says they cannot recreate the problem. The lady at NSTA was wonderful and helpful, but I got nowhere with the developer because I'm not home during business hours to talk to them about it. And I'm too busy with students at school to talk to anybody but students.
I got the reader running now on Safari on the iPad. The web browser version doesn't seem to work with Chrome. So I am reading my enhanced ebook now in the browser. I cannot recommend this app at all.