[kh99]

The problem I have (and the reason that I didn't test this before posting) is that I've never been able to get similar threads to work on a test forum. I really don't understand how they work - I used exactly the same word in the title and body of several threads but they still didn't score high enough to be considered "similar".

Anyway, I was afraid that the formatting might not be right, and I'm not big on the formatting stuff. You probably need to copy more of the surrounding formatting from the SHOWTHREAD template. Try this (where you modified the postbit_legacy template):

<vb:if condition="$post['isfirstshown']">
<div id="thread_info" class="thread_info block">
<!-- similar threads -->
</div>
</vb:if>