Use code below in the forumhome template instead to remove the username. It also makes the Avatar link to your profile and shows the username on hover.
Code:
<li>{vb:stylevar dirmark} <vb:if condition="$loggedin[avatarurl]">
</vb:if> <a class="username" href="{vb:link member, {vb:raw loggedin}}"><img height="20" width="20" class="inlineimg" src="{vb:raw loggedin.avatarurl}" border="0" title="{vb:raw loggedin.musername}"/></a>{vb:raw loggedin.invisiblemark}{vb:raw loggedin.buddymark}</li>
BT removing the commalist class stacks the images vertically I tried to add an additional css declaration with a simple float left that doesnt work either any inputs? Thanks