Start eboard and open a detached console. Connect to FICS (possibly other servers as well), and use the detached console for typing your login and password. Your password will then be typed in plain text in the detached console, instead of the stars that appear if you use to console in the main window. I guess this is a bug not a feature? :-) Anyway I use eboard 0.3.2pl1 from the package in debian sid (unstable). (gtk 1.2.10 and imlib 1.9.11 if that's interesting)
I've also attached the DEBUG.eboard from the session.
Please don't hesitate asking for more info if necessary. Btw, I love eboard. Thanks for creating it.