I'll file this as a bug for you. My gut says this is a Yuku issue rather than a computer issue, but that's just a stab in the dark. It's weird because I haven't been able to reproduce this; In addition to SeaMonkey, I've logged in via reply buttons in Safari 3.1.1, Firefox 2.0.0.14, Opera 9.50, and Camino 1.6.1. I also tried logging in with another profile. In the meantime, have you tried dumping both your cache and your cookies, exiting Firefox, then logging back in? You can dump these via the "Clear Private Data..." item in the Tools menu. Also, is it OK for a Yuku staff member to log into your account in case it helps him/her to reproduce this? They won't actually have your password; they use a master administrative password if they need to do that. You can say yes or no here; I'll link to this thread.