I'm having a similar issue.
I've just recreated a user update form and non of the data is populating the fields
$Paramid_SecurityAssisttbltraders = "-1";
if (isset($_SESSION["SecurityAssist_id"])) {
$Paramid_SecurityAssisttbltraders = $_SESSION["SecurityAssist_id"];
}
I know the session is working as I can echo it on the page.
I think I have this figured but not solved
all of my fields are set up as follows
<?php echo((isset($_GET["invalid"])?ValidatedField("userupdate","my_Field_name"):"")); ?>
but they should be set us as
<?php echo $row_SecurityAssisttbltraders['my_Field_name']; ?>