I'm running Ubuntu 12.04 64bit.
I'm not able to see my workgroup and network shares when clicking on Browse network in nautilus. This is very important for my work.
I can access Windows and Ubuntu folders typing nautilus smb://192.168.x.x in the terminal.
A windows PC can access Ubuntu's shares.

smbtree doesn't give anything. Samba, samba-common, winbind are installed; smbpasswd has been set up.

Any help would be appreciated.