This wouldnt work for me. I do have MSSQL.
Fix:
LocalSettings.php for default install:
$URLSplit = "/index.php?title=";
yambe.php: (around line:205)
$res = $dbr->select(array ("revision", "text", "page",),
//"old_text",
"Top 1 old_text",
array( "page_title" =>$pgName, "page_namespace" => $ns),
__METHOD__,
//array ("ORDER BY"=>"rev_id desc limit 1"),
array ("ORDER BY"=>"rev_id desc"),
array("text" => array ("LEFT JOIN", "old_id=rev_text_id" ),
"revision" => array( 'LEFT JOIN', 'rev_page=page_id')));