My XP-sp3 computer runs an app (smartwallpaper) that changes my wallpaper to a new pic every minute. Lately, even though the app creates a new wallpaper.bmp file in the \windows folder every minute, the desktop display doesn’t change. If I look at display properties, the desktop tab DOES show the new image. If I change position to center or stretch and then APPLY, the new image appears on the desktop. I’ve scanned for virus/malware. Why doesn’t the desktop refresh with the current wallpaper.bmp image?