It definitely the periods in your usernames, and I don't know if anything can be done. We all have two url's to our profiles; one by username and one by an id number, and the username version is the one that's not working for you.
For example, melanie.fera's:
http://member.nin.com/profile/view?user_id=113218 [
member.nin.com]
http://member.nin.com/member/melanie.fera [
member.nin.com]
The first takes you to your real profile, the second takes you to user 'melanie's' profile instead. Not sure if 'melanie' is another real user or somehow is a duplicate of your own profile that has occurred in the system because of the period.
To get to your profile, click on your avatar on a post that you've made, which links with the ID number. Then bookmark it so you can easily get to it. Kirkis.M - this may be your problem; you could be linking to 'Kirkis' instead of 'Kirkis.M' and you are unable to change anything.