I have problem with desktop wallpaper. Every time I close my laptop lid, laptop goes in standby mode and after opening lid and entering password wallpaper is changed. For example if all programs were minimized and after closing/opening lid wallpaper changes to black. If Net Beans is maximized and if I close and open lid, enter password wallpaper changes. If I now minimize Net Beans, wallpaper takes look of maximized Net Beans (it looks like I took screen shot of my Net Beans while I were using it and put it as desktop wallpaper 0.o) and I have to go to System Settings > Appearance and change wallpaper. It happens every time no matter what program is maximized at the moment when I lose lid it will take its look after opening lid or it would change to black if all programs were minimized. This happens for a while and I have no idea why or how to fix it.
OS: Ubuntu Unity 12.10 Laptop: Acer 5750