We faced numerous challenges in our recent development with user names that include other than A-Z, 0-1 and Underscore (_) characters.
We will be fixing user names that include dashes, spaces, and periods by replacing them with underscores, and by removing whatever other characters that might cause issues when are a part of a page address (URL).
If you cannot log in to your account due to a change of your nick, simply click the "Forgot Password" link and an email will be sent to you with your revised name and a new password. You can later change your password back to your liking from your control panel.
Winter Sale: If you don't like your user name (nick) - send me a PM with a name that you do like, and we'll change it for you through the month of October 2008.