I've got a problem with Sencha Touch 2.1 and Android 4.0.3 (problem don't occur with 2.2 & 2.3).
I did a native build via sencha command and installed the app on my Samsung device.
Everytime I touch the screen with two fingers at the same time, my app freezes. When I tap for exemple on a button in the footer it get's active but the view doesn't change.
Sometimes I can make the app working again whith pinch-out but not often.
I wrapped it also with PhoneGap and got the following error in logcat:
D/CordovaLog(12706): Uncaught TypeError: Cannot read property 'point' of undefined