Due to a bug in IE 6 and IE 7, we’ve had to make the requirements for user names more strict.
You are no longer allowed to have an underscore in your username;
I’ve gone through and reset portfolios who’s user-names have an underscore, so when you go to manage your portfolio you’ll be asked to change your name again.
If it doesn’t seem to be redirecting for you visit http://portfolio.cgsociety.org/manage/login_register.php
Sorry for the inconvinience.