Hey there.
My startupImages are not working when I safe an app to my homescreen on my iPhone 5 iOS 6.0.2.
In the index.html its correctly shown...

Code:
Ext.Loader.setConfig({
    disableCaching: false,
    enabled: true,
    paths: {
        Ext: 'src'
    }
});
Ext.application({
    viewport: {
        autoMaximize: true,
        preventZooming: true
    },
    models: [
        'CountryModel',
        'RegionModel',
        'CustomerResults',
        'CustomerDetails',
        'ContactDetails',
        'ContactResults'
    ],
    stores: [
        'CountryStore',
        'RegionStore',
        'CustomerSearchResultsStore',
        'CustomerDetails',
        'ContactPersonsByCustomer',
        'ContactSearchResultsStore',
        'ContactDetails'
    ],
    views: [
        'EntryPanel',
        'CustomerListPanel',
        'ContactsListPanel',
        'SearchCustomersPanel',
        'SearchContactsPanel',
        'CustomerDetailPanel',
        'mainNavigation',
        'ContactDetailPanel'
    ],
    icon: {
        '57': 'resources/icons/icon.png',
        '72': 'resources/icons/icon-72.png',
        '114': 'resources/icons/icon-114.png'
    },
    name: 'MyApp',
    startupImage: {
        '320x460': 'resources/startup/320x460.jpg',
        '640x920': 'resources/startup/640x920.png',
        '640x1096': 'resources/startup/640x1096.png',
        '768x1004': 'resources/startup/768x1004.png',
        '748x1024': 'resources/startup/748x1024.png',
        '1536x2008': 'resources/startup/1536x2008.png',
        '1496x2048': 'resources/startup/1496x2048.png'
    },
    controllers: [
        'MapController',
        'CustomerController',
        'ContactsController',
        'Logics',
        'EntryController'
    ],
    launch: function() {
        Ext.create('MyApp.view.mainNavigation', {fullscreen: true});
    }
});
And here is a part of the the index.html:
HTML Code:
<link rel="apple-touch-startup-image" href="resources/startup/640x1096.png"