Group Policy Desktop Wallpaper Black
I have a strange problem where every so often one of my users who has our corporate desktop wallpaper deployed via Group Policy will log on and find that it is now just a black wallpaper. It seems to happen at random but once it has happened the wallpaper does not come back. If I clear the registry keys where the wallpaper is specified and reboot it comes back but only for one day and then it goes black again.
Strangely, if I set the computer to be in High Contrast mode and then take it back out of high contrast mode, the wallpaper reappears but again only for one day. Any help would be greatly appreciated.