after update (forced via Sony) from Android 2.3.4 to 4.0 4 Application based on Image Target stop working correctly. (vuforia 1.5.9)
After app start splash screen apears but when camera is starting all layouts hides (sometimes blink for a milisecound) camera is working. after scan something cube shows only for milisecound ...
while writing this I saw that I test it on vuforia 1.5.9 I will test 2.0 today and if its ok I will close this topic.