massizero, like I said I didn't edit anything on postibit_legacy to make it work. But I made a test post on my board and here it goes the source code of the page, I removed everything but the legacy post code. I've marked bold the part that were Plus Mood legend appear.
May be you already edited your postbit_legacy and removed some markers like e.g. <!-- / status icon and date --> that mods like this use to locate and place what they need.
Check this out, this might help you.
Code:
<div id="posts"><!-- post #24575 -->
<!-- open content container -->
<div align="center">
<div class="page" style="width:100%; text-align:left">
<div style="padding:0px 25px 0px 25px" align="left">
<div id="edit24575" style="padding:0px 0px 6px 0px">
<!-- this is not the last post shown on the page -->
<table id="post24575" class="tborder" cellpadding="6" cellspacing="0" border="0" width="100%" align="center">
<tr>
<td class="thead" style="font-weight:normal; border: 1px solid #E0E0F6; border-right: 0px" >
<!-- status icon and date -->
<a name="post24575"><img class="inlineimg" src="/images/statusicon/post_old.gif" alt="Old" border="0" /></a>
Yesterday, 23:46
<!-- / status icon and date -->
</td>
<td class="thead" style="font-weight:normal; border: 1px solid #E0E0F6; border-left: 0px" align="right">
#<a href="showpost.php?p=24575&postcount=381" target="new" rel="nofollow" id="postcount24575" name="381"><strong>381</strong></a>
</td>
</tr>
<tr valign="top">
<td class="alt2" width="175" rowspan="2" style="border: 1px solid #E0E0F6; border-top: 0px; border-bottom: 0px">
<div id="postmenu_24575">
<script type="text/javascript"> vbmenu_register("postmenu_24575", true); </script>
</div>
<div class="smallfont">Junior</div>
</div>
<div class="smallfont">
<br /><a href="member.php?u=57"><span class="fade">
<img src="image.php?u=57&dateline=1213733894" width="80" height="53" alt="Test's Avatar" border="0" /></a>
</div>
<div class="smallfont">
<br />
<div>Join Date: Feb 2008</div>
<div>Location: S?o Paulo</div>
<div>Age: 34</div>
<div>
Posts: 877
</div>
<br />
<fieldset><legend>Mood</legend>
<div align="center">
<img class="inlineimg" src="images/images_mood/surprised.gif" alt="Surprised" border="0" />
</div>
</fieldset>
<br />
Rep Power: <span id="reppower_24575_57">26</span> <div><span id="repdisplay_24575_57"><img class="inlineimg" src="/images/reputation/reputation_pos.gif" alt="Test is on the right way" border="0" /><img class="inlineimg" src="/images/reputation/reputation_pos.gif" alt="Test's on the right way" border="0" /></span></div>
<div> <a href="#" onclick="imwindow('skype', '57', 400, 285); return false;"><img src="http://mystatus.skype.com/smallicon/test.teste" alt="Send a message via Skype™ to Test" border="0" /></a></div>
</div>
</td>
<td class="alt1" id="td_post_24575" style="border-right: 1px solid #E0E0F6">
<!-- icon and title -->
<div class="smallfont">
<img class="inlineimg" src="/images/icons/icon1.gif" alt="Default" border="0" />
</div>
<hr size="1" style="color:#E0E0F6; background-color:#E0E0F6" />
<!-- / icon and title -->
<!-- message -->
<div id="post_message_24575">
"Mood Test"
</div>
<!-- / message -->
<tr>
<td class="alt2" valign="bottom" height="100%"style="border-right: 1px solid #E0E0F6">
</td>
</tr>
<tr>
<td class="alt2" style="border: 1px solid #E0E0F6; border-top: 0px">
<img class="inlineimg" src="/images/statusicon/user_offline.gif" alt="Test is offline" border="0" />
</td>
<td class="alt1" align="right" style="border: 1px solid #E0E0F6; border-left: 0px; border-top: 0px">
<!-- controls -->
<a href="newreply.php?do=newreply&p=24575" rel="nofollow"><img src="/images/buttons/quote.gif" alt="Reply With Quote" border="0" /></a>
<!-- / controls -->
</td>
</tr>
</table>
<table class="signature" width="100%">
<tr>
<td class="alt2">
<!-- sig -->
<div>
<font size="2">Signature Teste</font><br />
</div>
<!-- / sig -->
</td>
</tr>
</table>