I am getting a white screen when running my Sencha Touch 2.1 web app from an iphone home screen shortcut. My test page is a simple tab panel (code below). Everything works fine in iphone safari and from desktop safari. No javascript errors. However, it stops working when run from the home screen icon. I've had success with showing a regular panel and a list from the home screen shortcut. I've had failure (white screen) with the tabpanel and navigationview so far. Anyone else?

Code:
Ext.setup({
       
    onReady: function () {

       Ext.Viewport.add( {xtype:'tabpanel',
           fullscreen: true,           
            items: [{
                     title: 'Test'                         
                    }]
        });
               
    }

});