Comment 96 for bug 1098334

One very effective way to accelerate the appearence of the issues (which may help debugging) seems to be using libreoffice draw/impress. Drawing large shapes (or even better importing large bitmaps) and then selecting them causes a sort of a grid to be drawn over the shapes and then to be erased after the object is not anymore selected. Doing this a few times is often sufficient to cause incorrect drawing or erasing of the grid or incorrect redrawing of the image under the grid.