Lack of tab icons for android

I have just started with appcelerate, and I cannot get the icons to appear on the tabs in my android. I am running the simplest of apps, taken from the examples:

module.exports = ApplicationTabGroup;

function ApplicationTabGroup() { var self = Ti.UI.createTabGroup();

var fugitiveWindow = Titanium.UI.createWindow ({
    height:Titanium.UI.FILL,
    width:Titanium.UI.FILL
});

var fugitiveTab = Titanium.UI.createTab({
    title:L('fugitive_title','tab1'),
    icon:'images/fugitives.png',
    window:fugitiveWindow
});

fugitiveWindow.containingTab = fugitiveTab;
self.addTab(fugitiveTab);

var capturedWindow = Titanium.UI.createWindow ({
    height:Titanium.UI.FILL,
    width:Titanium.UI.FILL
});

var capturedTab = Titanium.UI.createTab ({
    title:L('captured_title','tab2'),
    icon:'images/captured.png',
    window:capturedWindow
});

capturedWindow.containingTab = capturedTab;
self.addTab(capturedTab);

self.setActiveTab(1);

return self;

}

I have added "<property name="ti.android.fastdev" type="bool">false</property>" to TiApp.xml and the images are transparent, the case of the file names are correct and I am running Titanium Studio, build: 2.1.2.201208301612.

I would appreciate it if someone can explain what I am doing wrong!