Android: Apps don't always start properly

Using the enterprise packages offline 5.3.0 beta x64 linux and Mac/Android/iOS.

Scenario 1:

• Create a new Qt Quick Controls project or open the Qt Quick gallery example
• Build using either armv5 or armv7 build
• Deploy the app using Qt Creator

=> Problem the app is launched but freezed in a full white or black screen

Also when you stop the app from Qt Creator, the app is closed but is still running in the background (looking at the running apps list)

Scenario 2:

Using the same builds and the Quick forecast demo, the app cannot be deployed with error:
"
BUILD FAILED
/home/caroline/android/android-sdk-linux/tools/ant/build.xml:653: The following error occurred while executing this line:
/home/caroline/android/android-sdk-linux/tools/ant/build.xml:698: null returned: 1"

Are the android builds made differently now, that would cause such problems? Shadow building maybe?