Not sure about AmFTP. I just use AmiTradeCenter:
http://amitradecenter.net/ as my FTP Client.
Do you have AmiSSL (or MiamiSSL) installed?
http://www.heightanxiety.com/AmiSSL/ . AmiSSL + IBrowse 2.3 works for me most of the time. (I can use it for my bank, but I can't for my girlfriend's bank since it insists on Netscape or IE and I can't seem to spoof.)
