Apps freeze screen when launch application after onPause

[giulio]

Hello.
I list the sequence of operations that causes me problems.
I launch my application from eclipse, my application is correctly visualized, when I press the home button, system returns to the screen principal of android, when I click on the icon of my application the screen freezes, my application is not started, is not called none of the functions: onResume, onRestart or onCreate.
Thanks to everybody.