it's the same problem.
in the admin_gallery/common/galleryadd.php and gallerydelete.php pages, the code for Security assist had been changed to use a different version than the original power gallery files:
<?php require_once( "../../../webassist/security_assist/helper_php.php" ); ?>
i edited that to the original version:
<?php require_once( "../../WA_SecurityAssist/Helper_PHP.php" ); ?>
there are probably other files ion the power gallery site that this has happened to, you may want to replace the power gallery files on your site with freshly downloaded copies.