Hi,
If anyone here has any experience or knowledge related to this issue, I would be extremely grateful for your input.
Even a small suggestion or a nudge in the right direction could make a significant difference for me.

...the rest. Next phase is to use recursion to make a Sierpinski Triangle.

// Inner triangle pt1.setX(pt1.x() + side1.dx()/2); pt1.setY(pt1.y() + side1.dy()/2); pt2.setX(pt2.x() + side2.dx()/2); pt2.setY(pt2.y() + side2.dy()/2); pt3.setX(pt3.x() + side3.dx()/2); pt3.setY(pt3.y() + side3.dy()/2); side1 = QLineF(pt1, pt2); side2 = QLineF(pt2, pt3); side3 = QLineF(pt3, pt1); myTriangle.clear(); myTriangle << side1 << side2 << side3; mypainter.setPen(Qt::red); mypainter.drawLines(myTriangle);

Using the minimal example above, I fixed this by removing this call in our QOpenGlWidget subclass's constructor:

setAttribute( Qt::WA_PaintOnScreen, true );

Removing this got rid of the paintengine calls (and numerous other problems).

Thanks!!!!