Web application which was implemeneted on SDK 2.2.1 doesn’t update the UI after screen was turned off and on on Z1.

I’ve debugging it and a touch event was triggered properly. but UI which was defined on CSS was not drawn at all.

An interesting thing is that it works in case of  foreground running  from background running by home button.

and it was working fine on device which support SDK 2.2.1.

Need your advice who experienced similar thing.