Will not open on iPad – Enlighten Manager Review

I have never had a problem with this app on my iPad until today, been using it for one and half years. When selected I see the opening Enlighten screen initially then it disappears and the iOS app select screen reappears. I can log on and use Enlighten via the web site with this iPad. I am running iOS 11 but that wasn’t a problem two days ago either.
Review by Osarco on Enlighten Manager.