nope it wont change .. i've tried every thing i know. it's driving me crazy ok i delete every thing in %USERPROFILE%\AppData\Roaming\Microsoft\Windows\Themes\ than i change to default windows 7 theme and that blue wallpaper (TranscodedWallpaper.jpg) came back.. so there is no problem with...
i have same problem i can change solid color but when i put a picture or default themes wallpaper wont change. it was fine a few weeks ago i dont know what i did on personalization it seems fine but it wont show up. there is no problem with aero