If you have problems.. go to the message board on GuildFTPd's home page. http://www.guildftpd.com or select the GuildFTPd chat menu from inside GuildFTPd.
1) Use Forwardslashes when adding paths.
2) Use "empty" password for anonymous access.
3) Most options are disabled when a value of zero is used.
4) Check all option checkmarks under system.
5) Min and Max Speed cause kick if violated (takes time to get good measure)
6) Read Help-About. There are many contributors to this software.