Titanium sdk 3.2.0 - problem with tab icon

this morning I upgrade my titanium to the latest version (sdk 3.2.0) but i find a bad surprise: my app doesn't display the tab icon anymore. Others images still work, so it shoud not be a folder issue. this is the code:

<Alloy>
    <TabGroup>
        <Tab titleid="homeTab" icon="/home.png" id="homeTab">
            <Require type="view" src="intro" id="homeID"></Require>
        </Tab>
        <Tab titleid="mapTab" icon="/map.png" id="mapTab">
            <Require type="view" src="map" id="mapID"></Require>
        </Tab>
        <Tab titleid="settingsTab" icon="/settings.png" id="settingsTab">
            <Require type="view" src="settings" id="settingsID"></Require>
        </Tab>
        <Tab titleid="aboutTab" icon="/about.png" id="aboutTab">
            <Require type="view" src="about" id="aboutID"></Require>
        </Tab>
    </TabGroup>
</Alloy>