[Nimdock]

Let me get something clear. Did you install two applications to try to get the wallpaper in all tabs?

If that is the case and you still have both installed I would uninstall "Diamond BackgroundChanger", restart the phone, and install mun_background4alltabs v0.2 again, by itself, could be overkill but it is worth a shot.

You don't need to find the mun application in programs or anywhere, you just change the wallpaper as usual and it should work.