code igniter : Weird problem : problem just in chrome : works fine in IE and Moz

[eluser]BaCeTo[/eluser]
$this->session->userdata('a') may be unaccessible in the view. You may try with $CI = get_instance();
and then $CI->session->userdata. $this variable will be accessible only in the controller. You shouldn't be able to use it inside the view. Also you are loading "model_a" in the example, but then try to access model_b. How does that work for you ?