Problem with Sorting of Rating on the basis of Total rating

Dear Plugin Author,

I am facing the problem with sorting the rating on the basis of total rating and I have used following code:-
$Qry = query_posts(“cat=-51&gdsr_sort=rating&sort_order=DESC&posts_per_page=24&paged=”.$paged);
Some time this is work and some time not. Can you help me to sort out this issue.
I am working on following site:-
http://www.foodpinup.com/rankings/

I will be waitng for your reply.

Regards,
Rajeev

http://wordpress.org/plugins/gd-star-rating/