Sessions working in one controller and not the other

For some reason, the session handling works in one controller and not
the other. I can't figure out why. I am using CakePHP 1.2.5.

//
//Does work
//

sessions_controller.php:

class SessionsController extends AppController {
var $name = "Sessions";
var $layout = "ajax";
var $uses = array();

function create(){
if($this->Session->read('Data') == null){
$this->Session->write('Data', rand());
}
$this->set('data', $this->Session->read('Data'));
$this->set('SessionID', $this->Session->id());
}
}

create.ctp:
$msgJson["SessionID"] = $SessionID;
$msgJson["data"] = $data;
echo json_encode($msgJson);
//results in ({"SessionID":"sd8s8o32edmjnjt94ouse99fd2","data":19409})
every time (parenthesis not in result)

//
//Doesn't Work
//

messages_controller.php:

class MessagesController extends AppController {

var $name = 'Messages';
var $layout = "ajax";

function listMessages() {
if($this->Session->read('Data') == null){
$this->Session->write('Data', rand());
}
$this->set('data', $this->Session->read('Data'));
$this->set('SessionID', $this->Session->id());
$this->set('messages', $this->Message->find("all",
array("order"=>"priority ASC")));
}

}

list_messages.ctp:

$msgJson["count"] = count($messages);
$msgJson["SessionID"] = $SessionID;
$msgJson["SessionData"] = $data;
foreach($messages as $message){
$msg[] = $message["Message"];
}
$msgJson["items"] = $msg;
echo json_encode($msgJson);
/*
results in ({"count":3,"SessionID":"","SessionData":27384,"items":
[{"id":"4","priority":"3","subject":"Another
message","message":"adsfasdf"},
{"id":"2","priority":"3","subject":"testing again","message":"just
seeing ow "},
{"id":"7","priority":"3","subject":"asdgasdg","message":"asdfasdfasd"}]})
except the SessionData changes everytime and the SessionID never shows
up.
*/

Any ideas what might be wrong?

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