For the second bug:
After stopping the activity or break, I want to exit the application by pressing the back-button. Although it seems that the application window is zooming out in order to close the app, nothing happens. The screen just "jumps", indicating that the app was brought to the foreground and it is not possible to exit the app via the back-button.
However, if I press the home-button, the app closes aa expected.
It's nothing major, but I was really surprised the first time and thought I had several instances if the app running.
Cheers & thanks!