Qt 4.7 + QGLWidget causes lock up when window resizes/moves

[high_flyer]

This:

myGlWidget = new QGLWidget(this);
 
    connect(myTimer, SIGNAL(timeout()), this, SLOT(updateRender()));
 
    myTimer->start(0);

myGlWidget = new QGLWidget(this);

    connect(myTimer, SIGNAL(timeout()), this, SLOT(updateRender()));

    myTimer->start(0);

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will cause your GL widget to update continuously( after other events have been processed).
Why do you use such a construct in the first place?
Are you sure this is what you want?
This could also explain the behavior you are experiencing, depending on how you implemented updateGL().

I tested the sample example below with Qt 4.6.1 that I had before and this works without any problems so it's something new with Qt 4.7.

If you did something wrong before which 4.6 somehow allowed, the fact 4.7 is not allowing it doesn't necessarily mean the problem is with the new Qt version (more like with the older version).