I have tried creating static builds of my application that I can run on other PCs that don't have Qt installed (the whole point of a static build...)

While I can build my application, and it runs fine on my Windows 7 Machine, it does not run on other computers.
Well, it does run (the process shows up in the Task Manager), but no window appears.

I'm using the C++ portion of my application only start up QML. The rest is all done in QML.

Now, when I complied Qt 5.4.0, I used the following options:

 configure.bat -static -debug-and-release -platform win32-g++ -prefix 5.4.0-static -opengl desktop -opensource -confirm-license -make libs -nomake tools -nomake examples -nomake tests

My main.cpp looks like this:

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQuickView>
#include <QtQml>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    return app.exec();
}

If that makes any difference, in the QML code, I include items like:

import QtQuick 2.4
import QtQuick.Layouts 1.1
import QtQuick.Controls 1.3
import QtQuick.Window 2.2
import QtQuick.Dialogs 1.2

But, yes, as mentioned below, I can build this, and it works on my PC.
On other PCs, I can see the process running in the Task Manager, but the Application Window does not appear.

Any pointers in where I go wrong are appreciated!
Thanks!