navBarHidden: true works, but then setinterval quits working properly?

Howdy, I have a fun little 'hello world' related app I'm making to get to know Titanium. It works GREAT, changing the value of a label once per second. However, when I add navBarHidden: true when creating a window, setinterval only runs twice or so, then gets stuck.

This is happening with my android emulator. Do I need to address this differently?:

Titanium.UI.setBackgroundColor('#000');
 
var app = Titanium.UI.createWindow({  
    title:'Amazing Newb App',
    backgroundColor:'#0099FF',
    navBarHidden: true
});
 
 
var label = Titanium.UI.createLabel({
    color:'#FFFFFF',
    text:'Yay for mobile apps!',
    font:{fontSize:25,fontFamily:'Helvetica Neue'},
    textAlign:'center',
    width:'auto'
});
 
var blinkVis = 1;
 
app.add(label);
 
app.open({});
 
setInterval(function () {
    if(blinkVis == 1) {
        label.text = "Whoohooo!";
        blinkVis = 0;
    } else {
        label.text = "Yay for mobile apps!";
        blinkVis = 1;
    }
}, 1000);

Chris