wallpaper automatically turns black & white

Dude i had the same problem, i searched the whole internet looking for the solution to this!! But i cracked it! Its really simple, go to your wallpaper window where you can choose different wallpapers you already (if) and customise the wallpaper to natural and save it and then choose any one of other which does not have any black and white filter and use that wallpaper for a minute and change back to whichever you want. It worked for me and i hope it does for you too

Update! It didnt help me first but then i changed it manually and it worked! Just change it from natural to bnw and then again natural to all the wallpapers