OK, so it is the security question that is failing validation,
To get a little more information on the problem, can you change the die statement:
die($WAFV_Errors);
to:
echo("<pre>");
var_dump($_SESSION);
echo("</pre><br />");
die($WAFV_Errors."|".$_SESSION["random_answer"]."|".$_POST["fieldset_group_nbsp"]);
and post back the results.