[Lynne]

I suppose you can switch the musername with title in the postbit. ie:
Current Code (for me, your's could be different):

                <div id="postmenu_$post[postid]">
                    <if condition="$show['profile']">
                    <a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[musername]</a>
                    $post[onlinestatus]
                    <script type="text/javascript"> vbmenu_register("postmenu_$post[postid]", true); </script>
                    <else />
                    $post[musername]
                    </if>
                </div>

                <if condition="$post['usertitle']"><div class="smallfont">$post[usertitle]</div></if>

Change to:

                <div id="postmenu_$post[postid]">
                    <if condition="$show['profile']">
                    <a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[usertitle]</a>
                    $post[onlinestatus]
                    <script type="text/javascript"> vbmenu_register("postmenu_$post[postid]", true); </script>
                    <else />
                    $post[usertitle]
                    </if>
                </div>

                <if condition="$post['musername']"><div class="smallfont">$post[musername]</div></if>

I'm guessing that would work, but I haven't tried it. You should try it on a test site or test style first. You can deleted the last line in there if you don't want the username to show at all.