Code:
<if condition="$vboptions['vbpager_active'] AND $bbuserinfo['userid']">
<a href="#" onclick="window.open('forum/pager.php?do=buddylist&puserid=$loggedin[userid]','pagerbuddylist','statusbar=no,menubar=no,toolbar=no,scrollbars=yes,resizable=yes,width=$vboptions[vbpager_width],height=$vboptions[vbpager_height]'); return false;"><img src="../forum/images/misc/comment.gif" alt="<phrase 1="$post[username]">$vbphrase[pager_send_pager_message_to_x]</phrase>" border="0" /></a></if>
Change it to $loggedin[userid] as per the above and it should work, at least it does on my site.