[Opserty]

 <div id="postmenu_$post[postid]">
                    <if condition="$show['profile']">
                    <!-- v3 Arcade --> <if condition="$post['arcadeawards']"><a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]"><img src="$vboptions[arcadeimages]/trophy.gif" align="absmiddle" alt="$vbphrase[arcade_champion]" border="0" /></a></if>
<!-- /v3 Arcade -->
                    $post[onlinestatus]
                    <script type="text/javascript"> vbmenu_register("postmenu_$post[postid]", true); </script>
                    <else />
                    $post[musername]
                    </if>
                </div>

You've made some changes to show the Arcade thing there. But it seems you have erased the Username Variable.

When Adding or Editing a Single Template there is option of Comparing Templates so you could use that to find out what you have erased.