Graphical issue when restoring the dopus window

When restoring dopus from the taskbar icon or double clicking on desktop and it appears on screen there is a flash of white while it is drawing the background (image or no image but a different colour to white). It only lasts for a fraction of a second but is more noticeable at night.

That's something Windows does before the program has had a chance to draw itself. I don't think we can change it.