K - I tried everything I could read about this and finally found a solution. So, I hope this works for all of you who are having the same issue.
I added the following line to the /etc/proftpd.conf file:
DenyAll
I’m using CentOS 5.5
Virtualmin… 3.83.gpl GPL
Webmin: 1.530
ProFTPd version 1.32
It was found in the following article:
http://ubuntuforums.org/showthread.php?s=ddb0180d796638d614729e93bedde0c1&t=220071&page=2
Thank you Ryan… you were a big help.