In that post, I stated that the app did not continue to work after leaving it, unless it was completely closed and relaunched.
After another week of using it, I finally recognized MY user error. I was failing to clear user data (simple tap on red X) to change patrons, and the system was searching for books while I was wanting a patron.
It was all me... the app clearly stated it was searching for items, not patrons. So I am happy to report it is working quite well.
In fact, I just used it to check in and check out books to an entire class.