I thought I saw something about this, but I can't seem to find it.
My app loses focus after the screen saver activates. If I remember correctly, after pressing a key, my app screen does show up. However, I'm unable to control my app. The only thing I can do is press the home key, and exit all the way out.
If it makes any difference, I have a posterboard screen, which goes to a springboard screen, which goes to an imagecanvas...