Why does my avatar look blurry or just have a letter?
The avatar sizes in the new forum are a bit different than the old. So old existing avatars may now appear stretched or blurry. If your avatar is just a letter it means you didn't have an avatar image before. The new software automatically gives you a letter and color based on your username.
To change your avatar just click on your username in the upper right, then hover over your avatar, then click "edit". A window will pop up and you can either upload your own avatar or select from some preloaded ones.