Harry, I'm not too familiar with CoffeeScript, but the following code works for me in 10.7.5 and 10.8.4 - it seems similar to what you have:
function showNotify(title, message) {
var notification = Ti.Notification.createNotification({
'title': title || 'No Title',
'message': message || 'No Message',
'timeout': 10
});
notification.show();
}
showNotify("The Title", "The Message");
Hope it helps.