I found a bug ...
When I launch my android app for first time, no problem, but if I back in main applications grid and launch again for the second time, my application starts but remains on a black screen...
I have to go every time in the task manager to kill/stop my application and then restart it so that it works correctly ...
Note, in Android Runtime properties :
 Display Status bar
 Disable default back button behavior
[X] End application when not in foreground
Samsung Galaxy SCL - GT-I9003
GINGERBREAD - 2.3.6