When I backplot there is a flashing or trailing tool image, why?

If you are using an Nvidia Quadro FX graphics card, and are experiencing a flashing or trailing diplsay when using Backplot, you need to disable a setting for the graphics card. Go to the graphics card settings, and to the “Open GL Settings”. Deselect the “Use unified back/depth buffer” setting. This will fix the problem. Note: The standard Nvidia FX card does not have this setting.