The only problem I see with this, and this is why max height would ultimately be better - is that it makes signatures smaller than 150px become 150px - and that wastes more space than it ultimately saves in the end.
I can't do this for member_profile_signature...how do I apply it there? It's not working...here's my code:
<br />
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder">
<tr>
<td class="thead"><strong>{$lang->users_signature}</strong></td>
</tr>
<tr>
<td class="trow2">{$memprofile['signature']}</td>
</tr>
</table>
still working in MyBB 1.8 thanks again!