WordPress Ajax functionality not working

I have updated wordpress 3.5.2 and using Elemen theme in my wordpress site.
The problem i am having is in admin side Ajax functionality is not working.
I have tried disabling all the plugins but that has not helped me till now.
I have used define( 'CONCATENATE_SCRIPTS', false ); in wp-config.php,
but even that hasn’t been working for me.

Please guide me now what should i check to work it in my favor.

themify.me/themes/elemin