If you are finding you can't login, getting an error of some sort saying your username doesn't exist. That is probably because your username doesn't exist anymore.
A bunch of accounts got deleted and we don't know why yet. Rest assured we are looking into it.
So if you are affected by this, register again, you can use the same email you used on your old account since its been deleted from the database and won't be detected as a duplicate.
Once you get fully registered again, send me a PM with the username that showed up on your posts, and I'll get all your old posts hooked up to your new username.
We sincerely apologize for this trouble. Sorry for the inconvenience.