Problems with fluxbox anf fbsetbg

[Kaminos]

Hi.

I'd like to set a random wallpaper from a directory, do I'm using fbsetbg -r in the init file from the fluxbox.

But rather than setting a random wallpaper, it sets the one that is the most in the middle (number 11 if there are 21 wallpapers) and it won't change, unless I delete the "lastwallpaper" file. In that case, it(ll work for 2 or three times, and then it'll set the wallpaper from the middle.

Can someone teach me how to fix it ?

Thanks in advance