I made the mistake of updating the iOS app through the App Store tonight.
First, my Lookup feature stopped working and would only bring up English dictionaries. This has happened before (in the early days of the app), so I thought "not a problem." I uninstalled the app, and then re-downloaded it. I opened the app and entered my sign-in information. It took 20 minutes to get to 97% on "preparing your library" and then locked up. I had to shut down the app. Now, all my resources are unavailable.
Who is doing your server management? This is the third problem I have had across platforms (Mac issues on L5 earlier today), and I know it is tied to the servers not being able to handle the load of L6 and the updates on L5. So, naturally you threw an iOS update in as well?
iPad Air 32GB running iOS 8.1; MBP mid-2009, SSD and 8GB RAM running Yosemite...neither running L5 right now. Good thing I don't need Logos for work...oh wait. I do.