Changing Samba User Password Error

Hi, I have a strange problem on my Debian 5 Lenny

When I go to > Samba Windows File Sharing > Samba Users - Edit Samba users and passwords > “user-name” > Edit Samba users and passwords > New Password

Passwords with / are not accepted:

Access control violation : Failed to change password using smbpasswd :

when I go to shell and use, smbpasswd -a user-name, its no problem to use / in a password.

Can somebody help me??

Greetings from Germany