You may have noticed with the new theme the old uploaded avatars are no longer being used - instead we've converted to the Wordpress standard of using Gravatar.com. Hit the link, sign up for a free Wordpress.com account with the same email address you used on TGN and you'll be able to customize your Avatar on any site that supports Gravatar.
Also, in an effort to reduce friction, we've added the ability to post comments by signing in with your existing Facebook, Twitter or Google account. The old login system also works fine, if you prefer to use that. The implementation is a little buggy, so we're turning it off for now.