When I restart my computer, why the wallpaper that I selected with Wallpabox is not my current wallpaper ?
Check if fbsetbg -l is launched on startup.
fbsetbg -l must be added in your ~/.fluxbox/startup file in Fluxbox or in your ~/.config/openbox/autostart.sh in Openbox
It does not work ?
Remove the ~/.fluxbox/lastwallpaper file and reselect a wallpaper with Wallpabox.