It appears that the link to a user's profile from the forums is broken, however navigating through the site the user profile comes up fine.
Pei, just to make sure; when you entered stuff for your homepage/profile, did you click the Update Homepage button at the very bottom of the page? I can load your homage, and I just get the default notice that you haven't created one yet. I just edited mine, and the edit went through normally. Well, aside from changing what I entered as "Firefury's Homepage" to "Firefury\'s Homepage"