I've tried to set up the scene in Unity according to the tutorial but it crashed when I open the app on my phone.
Phone : Samsung Galaxy S
Firmware : Froyo Android 2.2
Graphics level : OpenGL ES 2.0
NativeActivity : Unchecked
Stripping level : Disabled
Unity Version : 3.3 0f4 (63135)
Battery Power : Full
Issue : App crashed and close off by itself.
I've tried building another scene without QCAR, a scene with normal camera and cubes. It is able to work. Then I use Application.Loadlevel to load the scene with QCAR Gameobject again, it crashed.