I too have the same problem....
I am on version 1.6.1 of PS with theme939
site: www.shishafreak.com
I tried .....
Setting all caches to NO
in CCC Smart cache for Java to NO
Clearing the cache
and still noting!
I have been at this for 3 days now, very frustrating, when I call Prestashop they tell me I have to purchase a Support plan of a minimum of 400$
No New customers can sign up on my site.
I can not believe, there is no one here that can offer me a solution that works and will not cost 400$.