When opening certain books in the android mobile app (for example, ACCS Introduction And Biographical Information), the app starts continually hanging. It freezes and no functionality works. The book can't be closed, the layout can't be changed, no functionality works, the app is basically frozen and unusable. It is very difficult to eventually put it back into a usable state, by 30 minutes of repeated restarts, retries, and random functionality attempts. Rebooting the android tablet has no effect.
I am using the latest 26.0.2 stable release.