I was stumped on this one for a bit, but I think I have a work around.
get your pages back to where the where before, then make a backup copy of the PowerCMS/WA_CMS/WA_CMS.php file, save it as WA_CMS2.php
In the backup version, comment out line 5:
//require_once( "../WA_SecurityAssist/Helper_PHP.php" );
on your pages, cahnge the following:
<?php include("PowerCMS/WA_CMS/WA_CMS.php"); ?>
<?php include("PowerCMS/WA_CMS/WA_CMS2.php"); ?>