I've created account (logged in) with drupal.org (or my own site) credentials and now I can't login or modify my post. What to do?
Important: As of November 1st, 2010 @drupal.org logins will not work anymore (http://drupal.org/node/926664). So please create a new account and contact us with the list of your submissions so we could transfer it to your new account.
This is a known issue unfortunately. It happens because of some miscommunication with drupal.org authentication service or network issues. There is no pattern for this error so it's almost impossible to fix.
Solution: you can wait for some time and try to login again or you can create local account at drupalsites.net and we'll transfer your posts to this new account. Just let us know if you choose this way.