Problem with ftp proxying

We have users who want to retrieve software via non-anonymous FTP.
He can login FTP server with a password, but cannot retrieve any
files expect under his home directroy.

This problem may be caused by squid-1.1.17 and 1.1.20. (I'm not
sure about squid-1.1.18 and 1.1.19.)

I mean that ftpget program recognizes user's home directory as own
root everytime.

E.g., If I try by way of a test, to acccess

        ftp://username:password@ftpserver/somewhere/foo.tar.gz

I get
        The following FTP error was encountered:

              somewhere/foo.tar.gz: Not a directory.

        This means that:

            The given URL does not exist, or is not readable.

Is someone have a clue on this?

Best Regards,

--
URA Hiroshi
IPC ITS, IBM Japan.
E-mail: ura@yamato.ibm.co.jp