Hello,
I can fix this problem for you. I have just finished these past days a module for Prestahop that uses javascript, more precise jQuery and ajax extensively. I will postpone all project so that i can fix this problem asap, possibly in 1 day. I must asses first the problem and see what it may be wrong. Can you give me your url so i can see the exact behaviour of the error ? ( have to analize it with firebug and see how the scripts behave)
Sincereley,
Kapsis