Nav Bar shows in Android on 3.4.0 but not in 3.2.3, what am I doing wrong?

With the following code the nav bar is hidden on 3.2.3 GA, But is visible in 3.3.0 GA and 3.4.0 GA.

Did the property change, what do I need to change to get this corrected so the nav bar is hidden?

var self = Ti.UI.createWindow({
        backgroundColor : '#F3F3F3',
        orientationModes : [Titanium.UI.PORTRAIT],
        fullscreen : false,
        navBarHidden : true,
        backgroundImage:"/images/bg.jpg"
    });