As the FTP logs show, the problem seems to be with the password, then. Maybe this will help in getting to the problem. Of course that the password reset isn't working either, but i wouldn't know what the problem is in that case. Because I'm getting HH emails, I just got the one asking me to renew the account (and I did successfully).
Isn't it a little bit weird that a big project (even if done voluntarily) only has one administrator to manage things? I mean it was obvious that he would end up not being present... I gess that's what we get for not wanting to waste some little cash on a paid host