QGLWidget inside QScrollBar newbie problem

["Alvaro Aguilera"]

 Hello everyone,
 
 I don't have much experience with QT or OpenGL but I have to make a small program using both of them and perhaps someone here can help me with the first issue I run into.
 
I have a QGLWidget that displays a map using the function glDrawPixels(), this widget is located inside a QScrollArea. Everything works fine until I zoom in a couple of times, if then I try to scroll down, I get a segmentation fault. If I debug the program with gdb, then my whole KDE dies.
 
 Here is some code:
 
 The main window:

/****************************************************************/
glMap = new GLMap(); 

scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Base);
scrollArea->setWidget(glMap);
setCentralWidget(scrollArea);
/****************************************************************/


The GLWidget (GLMap):

/****************************************************************/
void GLMap::initializeGL()
{
    glClearColor(255,255,255,255);
     glShadeModel(GL_FLAT);
     glDisable(GL_DEPTH_TEST);
     glPixelZoom( 1.0, 1.0 );
}

void GLMap::paintGL()
{
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
     glLoadIdentity();
     glDrawPixels(mapWidth, mapHeight, GL_LUMINANCE, GL_UNSIGNED_BYTE, mapBuffer);
 
}

QSize GLMap::sizeHint() const
{
     return QSize(ceil(mapWidth*zoomFactor),ceil(mapHeight*zoomFactor));
}

void GLMap::zoomIn()
{
     zoomFactor += 0.1;
     adjustSize();
     glPixelZoom(zoomFactor,zoomFactor);
     updateGL(); 
}

/****************************************************************/

Can anyone tell me what I'm doing wrong?

Thanks!

Avlaro.