bbPress.org

Figured out the avatar issue itself.

Basically used the following code (though this may not work for everyone – not sure if it’s based on theme):

#bbpress-forums div.bbp-forum-author img.avatar, #bbpress-forums div.bbp-topic-author img.avatar, #bbpress-forums div.bbp-reply-author img.avatar {
border: none;
max-width: 100%;
padding: 0;
margin: 12px auto 0 auto;
float: none;
}

#bbpress-forums p.bbp-topic-meta img.avatar, #bbpress-forums ul.bbp-reply-revision-log img.avatar, #bbpress-forums ul.bbp-topic-revision-log img.avatar, #bbpress-forums div.bbp-template-notice img.avatar, #bbpress-forums .widget_display_topics img.avatar, #bbpress-forums .widget_display_replies img.avatar {
float: none;
margin-bottom: -7px;
border: 3px double #ddd;
width: 15px;
height: 15px;
}