A WP core developer advised that my atahualpa 351 theme may contain the code quoted below and that it may be interfering with my author-avatar list plugin. He suggested that I find it and delete it. If it is in 351, what file and what would happen if I delete it?
img.avatar{float:left;display:block;margin:0 8px 1px 0;padding:3px;border:solid 1px #ddd;background-color:#f3f3f3;-moz-border-radius:3px;-