in the WAUE_email_1.php file, change line 10:
$MailSubject = "".replaceUserTokens($row_Mailing['MailingSubject'], $RecipArray[$RecipIndex][0]) ."";
to:
$MailSubject = "".replaceUserToken($row_Mailing['MailingSubject'], $RecipArray[$RecipIndex][0]) ."";