Also, to make the plugin’s output code validate I had to make these other changes.
Changed these lines:
$avatar = "<img alt='' src='{$src}' class='{$class} avatar-{$size} avatar-default' height='{$size}' width='{$size}' />";
// If not in admin pages and there is a URL, wrap the avatar markup with an anchor.
if(!empty($url) && $url != 'https://' && !is_admin()) $avatar = "<a alt='Avatar' href='" . attribute_escape($url) . "' rel='nofollow' title='" . (empty($name) ? '' : "Visit $name’s website.") . "' " . ($avatar_options['snapshots'] == 'on' ? '>' : "class='snap_noshots'>") . $avatar . "</a>";
to this:
$avatar = "<img alt='{$name}' src='{$src}' class='{$class} avatar-{$size} avatar-default' height='{$size}' width='{$size}' />";
// If not in admin pages and there is a URL, wrap the avatar markup with an anchor.
if(!empty($url) && $url != 'https://' && !is_admin()) $avatar = "<a href='" . attribute_escape($url) . "' rel='nofollow' title='" . (empty($name) ? '' : "Visit $name’s website.") . "' " . ($avatar_options['snapshots'] == 'on' ? '>' : "class='snap_noshots'>") . $avatar . "</a>";
Which added the user name as the alt text in the image tag, and i deleted the alt reference that was in the anchor tag.