Opengl and maximing viewport

[atlas]

I am trying to make a basic opengl app using QGLWidget and qt examples. I managed to make it show a basic grid on viewport and even change the viewpoint , but when i maximize the window it keeps showing a portion of the last rendered image in front of the actual view. This happens only when i maximize the window , resizing in any other way (minimize , change it in x,y direction) works fine.

I put breakpoing inside resizegl and it is activated when any resizing happens.

Below are some shots of what it looks like

when i start program
!http://www.leposit.com/qgl1.jpg!

when i maximize (1920X1080)
!http://www.leposit.com/qgl2.jpg!

@

void GL_Renderer_Widget::resizeGL(int width, int height)
{
glClear (GL_COLOR_BUFFER_BIT);//i put this here, trying to force clear screen on each resize
int side = qMin(width, height);
glViewport((width - side) / 2, (height - side) / 2, side, side);

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-0.5, +0.5, +0.5, -0.5, 4.0, 15.0);

}

void GL_Renderer_Widget::SetViewPort()
{
glViewport(0,0, width(), height());
glMatrixMode (GL_PROJECTION);
glLoadIdentity (); // Reset The Projection Matrix
gluPerspective(PerspectiveAngle, (GLfloat)(width())/(GLfloat)(height()), 0.1f, FarPlane );
}

void GL_Renderer_Widget::paintGL()
{
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );// | GL_STENCIL_BUFFER_BIT );

    SetViewPort();
    glMatrixMode (GL_MODELVIEW);
    glLoadIdentity ();

    gluLookAt(  EyePosition[0],EyePosition[1],EyePosition[2],
                    EyeDir[0] ,EyeDir[1] ,EyeDir[2] ,
                    LookUpV[0],LookUpV[1],LookUpV[2]);

   glEnable(GL_TEXTURE_2D);
   glPolygonMode(GL_FRONT_AND_BACK , GL_FILL);

    //Typing in White Color
    glColor3f(1.0f,1.0f,1.0f);
    renderText(5,10,QString(VendorInfo));
    renderText(5,20,QString(RendererInfo));
    renderText(5,30,QString(VersionInfo));
    renderText(5,40,QString("X: %1").arg(MouseXYZ[0]));
    renderText(55,40,QString("Y: %1").arg(MouseXYZ[1]));
   DrawBasicGrid();
    glFlush ();

}

@

I made a button in main window that activates clear screen and updateGL() so when i maximize and click it, it all shows right.

What am i missing here ?

I am using qt on windows 7 64bit with ming and my drivers are up to date.

[atlas]

Just noticed what whenever i maximize view , and problem occurs , but i click anywhere else except the actual opengl rendering windows , coming back restores proper rendering view.

1)i maximize and problem occurs
2)i click on windows start bar
3)i click back inside the render window
4)view is restored correctly

[atlas]

Dont know what it was that caused this , but now it works ...

I tried the following things but cant get any of these to recreate the problem (so i dont really know if any of those were creating the issue in the first place) :
1)Used old windows theme
2)Disabled ATI AI from catalyst
3)Change vertical refresh from gpu properties
4)Run exactly the same apps as before while running the program
5)Reboot
6)Clean all

I think it was just a glitch caused from undefined conditions (thought im sure reboot-clean all must have helped more)

Anyways if somene can , close this thread