createObject() now throwing Error: Insufficient arguments

Using: qt 4.7 built from b4c589868f278aa9a58ab9afa727dbf0a9442e22 (for Mac)

Starting with this build, createObject() is now throwing an "insufficient arguments error"

Code snip:

var component = Qt.createComponent(filename);
if (component.status != 1) {
return false;
} else {
var instance = component.createObject();
}