Log In Problem With Ie9

I have no clue what is going here, but IE9 on a specific machine(my boss laptop). He can not log in. No username/password error. As long as he clicks sign in, Yii does the sign in thing, but then redirect him to homepage.

IE9, Chrome , FF works on my machine, but not his IE9. He doesnt want to test Chrome or FF on his machine.

My guess is his IE9 does not set cookie/session correctly. What are the possible troubleshooter steps I should take ?

Here is my main.php config




<?php


// This is the main Web application configuration. Any writable

// CWebApplication properties can be configured here.

return array(

	'basePath'=>dirname(__FILE__).DIRECTORY_SEPARATOR.'..',

	'name'=>'Project Eden',

    'onBeginRequest'=>array('GFunctions','setTimezone'),

	

	// preloading 'log' component

	'preload'=>array('log'),

	'sourceLanguage'=>'en',

	'behaviors'=>array(

        'onBeginRequest' => array(

            'class' => 'application.components.behaviors.BeginRequest'

        ),

	),

	


	// autoloading model and component classes

	'import'=>array(

		'application.models.*',

		'application.components.*',

	),


	// application components

	'components'=>array(

		'user'=>array(

			 'class' => 'WebUser',

			 'loginUrl'=>array('site/index'),

		),

            

		'browser' => array(

   		 'class' => 'application.extensions.Browser.CBrowserComponent',

		),

		

		// uncomment the following to enable URLs in path-format

		/*

		'urlManager'=>array(

			'urlFormat'=>'path',

			'rules'=>array(

				'<controller:\w+>/<id:\d+>'=>'<controller>/view',

				'<controller:\w+>/<action:\w+>/<id:\d+>'=>'<controller>/<action>',

				'<controller:\w+>/<action:\w+>'=>'<controller>/<action>',

			),

		),

	),




	// application-level parameters that can be accessed

	// using Yii::app()->params['paramName']

	'params'=>array(

		 'languages'=>array('tr'=>'Turkish', 'en'=>'English', 'de'=>'Dutch'),

	),


	);