On your site, Cufon text replacement is changing the author box content- this might be why the avatar is disappearing, not sure
<a rel="author" href="http://minutemenministries.org/author/jimvangelderen/" class="authorsure-author-link"><cufon class="cufon cufon-canvas" alt="Jim " style="width: 27px; height: 16px;"><canvas width="41" height="16" style="width: 41px; height: 16px; top: 0px; left: -1px;"></canvas><cufontext>Jim </cufontext></cufon><cufon class="cufon cufon-canvas" alt="Van " style="width: 30px; height: 16px;"><canvas width="43" height="16" style="width: 43px; height: 16px; top: 0px; left: -1px;"></canvas><cufontext>Van </cufontext></cufon><cufon class="cufon cufon-canvas" alt="Gelderen" style="width: 65px; height: 16px;"><canvas width="72" height="16" style="width: 72px; height: 16px; top: 0px; left: -1px;"></canvas><cufontext>Gelderen</cufontext></cufon></a>
