[Lynne]

Find in postbit/postbit_legacy:

<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>

And change to:

<a class="bigusername" href="member.php?$session[sessionurl]u=$post[userid]">$post[musername]</a>
                    $post[onlinestatus]

(Not tested, but I'm pretty sure it should work.)

You can also remove all the stuff between the <!-- post $post[postid] popup menu --> tags.