[ForumsMods]

Edit postbit.css
Search:

.postbitlegacy .userinfo .postuseravatar, .eventbit .userinfo .eventuseravatar {
    display:block;
    margin:{vb:math {vb:stylevar padding}/3} auto 0;
    text-align:{vb:stylevar left};
    width: auto;
    float: {vb:stylevar left};
    clear: both;
}

Replace with:

.postbitlegacy .userinfo .postuseravatar, .eventbit .userinfo .eventuseravatar {
    display:block;
    margin:{vb:math {vb:stylevar padding}/3} auto 0;
    text-align:center;
    width: auto;
    clear: both;
}