Jquery ajax and opera 12

Jquery ajax and opera 12

My jquery ajax functions stop working in new Opera 12.

I don't know why ?  The code below always run error handler. It's the same domain request.

It's really strange because i can't find anything in google about this problem. What's going on ?
It's really major problem. It's opera problem or Jquery ? If it's opera problem, is there any workaround ?
I can change code, but i can't change users' browsers.

  1.      $.ajax({
           url: '/ajax.php',
           success: function(data){
              alert('success');
             },
         error: function(data){
           alert('error');
          },
         });