A password problem about proftpd

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hi!

i successfully installed the ispcp program but there is something wrong with proftpd.

the proftpd can be started but when a user create a ftp user, no matter what password he inputs, in the 'passwd' field of table 'ftp_users' it shows a ':' . and when i clean this field (not 'NULL'),users can log in with a empty password.

i think this is not about proftpd. maybe ispcp's encryption script is not working properly?

do you have any idea about this?

i'm using FreeBSD 7.