One quick thing...
In your Search Results Postbit edits on the second edit...
You have:
Find:
Code:
$post[typeprefix] <a href="showthread.php?$session[sessionurl]t=$post[threadid]$post[highlight]"><strong>$post[threadtitle]</strong></a>
Which doesn't exist...
This is what exists:
Code:
$post[typeprefix] $post[prefix_rich] <a href="showthread.php?$session[sessionurl]t=$post[threadid]$post[highlight]"><strong>$post[threadtitle]</strong></a>
(was missing teh $post[prefix_rich])
Also in the replace: The same $post[prefix_rich] needs to be added to make it work correctly.