This plugin is not working for me either – I’m using version 1.1.7 with WP version 3.1.3. The icons show up and change color when I hover over them, but they don’t do anything. Here’s the source code that gets rendered:
<li class="fontResizer" style="text-align: center; font-weight: bold;"><a class="fontResizer_minus" title="Decrease font size" style="font-size: 0.7em;">A</a> <a class="fontResizer_reset" title="Reset font size">A</a> <a class="fontResizer_add" title="Increase font size" style="font-size: 1.2em;">A</a> <input type="hidden" id="fontResizer_value" value="body"><input type="hidden" id="fontResizer_ownid" value=""><input type="hidden" id="fontResizer_ownelement" value=""><input type="hidden" id="fontResizer_resizeSteps" value="1.6"><input type="hidden" id="fontResizer_cookieTime" value="31"></li>