moon.qml: QGLShader::link: "No errors." error on powerfulwin7

I'm playing with the moon.qml example QML script.

I included a 'Light' property.
Code: see "moon.qml" and "moon-texture.jpg" in the attachment.

Result: very good on my WinXP PC (see "light.works.GIF")

But bad on a new and powerful Win7-PC (see "light.doesnt.work.win7.GIF")

Output: Several messages like:
"QPainter::begin: Paint device returned engine == 0, type: 1"
"QGLShader::link: "No errors.""

Graphic card: see "graphic.card.1.GIF" and "graphic.card.2.png".

What could be the problem here and how could I avoid it?
Do you have a hint for me?

Ciao,
George

P.S.: all mentioned files are in the ZIP-archive "shader.problem.on.win7.ZIP" too.

my moon.qml:
-------------------------------------------------

import Qt 4.7
import Qt3D 1.0
import Qt3D.Shapes 1.0

Viewport
{
   width: 640; height: 480

   light: Light
   {
       //direction: Qt.vector3d(1, 0, 2)
   position: Qt.vector3d(111, 111, 111);
   constantAttenuation: 0.3;
   spotExponent: 99;
   spotAngle: 99;
   ambientColor:"red"
   diffuseColor:"white"
   specularColor:"white"
   }

   Sphere
   {
       scale: 1.5
       levelOfDetail: 6
       axis: Qt.YAxis

       effect: Effect
       {
           texture: "moon-texture.jpg"
       }
   }
}

details: see discussion on
http://lists.qt.nokia.com/pipermail/qt-3d/2011-January/000319.html
http://lists.qt.nokia.com/pipermail/qt-3d/2011-February/000338.html