Guys,
To get this to work on 3.8.4 PL2 or any 3.8 actually! Use this in the template, this will fix the array issues you are having.
HTML Code:
<if condition="$post['replylink'] && THIS_SCRIPT == 'private'"> <a href="$post[replylink]&r=all" rel="nofollow"><img src="$stylevar[imgdir_button]/reply_all.gif" alt="$vbphrase[reply_to_all]" border="0" /></a> </if>
All we did was change the 'replylink' to replylink