proftp config auto change + ispconfig 2

Hi All

I have change ip address of the DefaultAddress in the file proftpd_ispconfig.conf from 127.0.0.1 to my server address 192.168.0.1. But automatically after some time the default address changes back to 127.0.0.1
Is there any scripts running from ispconfig changing manually edited parameters?
When the ftp server listens at 127.0.0.1 it takes long time to connect and when local address is specified the problem is ok.

DefaultAddress 127.0.0.1
<VirtualHost 192.168.0.1>
DefaultRoot ~
AllowOverwrite on
Umask 002
</VirtualHost>

Please let me know.

Tks
Teddy