[Samba] recycle not working

[Luca Ferrari]

Hi,
I've included the following configuration parameters in a share of mine:

        vfs objects         = recycle
        recycle:repository  = /mnt/cestino_samba_NAS/%u_%U
        recycle:repository  = /mnt/cestino_samba_NAS/%u_%U
        recycle:maxsize     = 1000000000
        recycle:exclude     = *.tmp,*.temp *.mp3 *.avi *.mpg *.mp4 *.~??
        recycle:keeptree    = yes
        recycle:directory_mode = 0765
        recycle:touch       = yes


but it does not work. Anyone has an idea of what I'm doing wrong? And when can 
I check for errors or clues?

Thanks,
Luca