I'm having trouble with flashdata

[eluser]insub2[/eluser]
I'm trying to pass an array of search results using flashdata but it's not working.

I have tried a string and different array. Both worked.

Code:

$resultsArray = $this->search->search($searchqueryStr, $near);

/*Both of these Worked
$resultsArray = 'string';
$resultsArray = array(    '1' => 'one',
                '2' => 'two',
                '3' => 'three',
                'array' => array (    'food' => 'pizza',
                            'god' => 'null',
                            'ddUrl' => 'http://www.google.com/maps?source=uds&daddr=155+Michigan+St+NW,+Grand+Rapids,+MI+(Grand+Rapids+Press)[email protected],-85.67034&saddr=42.9704710,-85.6686480'
                        ),
                'class' => 'l'
            );
*/

$this->db_session->set_flashdata('resultsArray', $resultsArray);

$empty = (empty($resultsArray))? 'empty' : 'not empty';
echo $empty.'!<br>';
echo '<pre>';
$flash = $this->db_session->flashdata('resultsArray');
$tryTry = (empty($flash))? 'flash is empty' : 'flash is full';
die ($tryTry.' - '.print_r($flash));

About the db_session, I'm using FreakAuth_Lite and if load the session's library, FAL freaks out.

Is there a size limit to flashdata?

UPDATE:
Using userdata instead of flashdata seems to work. But I'm still curious if there is a size limit or if there is some other reason for it not working.