I have the same problem, I did a simple app with one titlebar and a label, when I packed the app to Android, this fail with androidapilevel 15 (android 4.0.3) but not fail with level 10 (android 2.3.6).
In Android 4.0.3 (15) shown a blue screen with a wait indicator and stay always on this screen, don't change to the initial view.
In Android 2.3.6 (10) shown the blue screen for a time and then shows the intitial view.
I did the example with Architect 2.1.0 and sencha touch 2.1.1.
Using fiddler the only error that show is that the icon favicon.ico was not found (Error 404).
I have a time trying to solve this problem, because i have an entire app that i need to package to android, and I need to solve this soon.