jquery validation - remote method won't trigger after valid

email1: {
                    required: true,
                    blacklist: true,
                    beanEmailValidator: true,
                    minlength: 6,
                    maxlength: 70,
                    remote: {
                        type: "GET",
                        url: llbFieldValJSONURL,
                        data: {
                              fieldData : function() {
                                return $("#enterEmail").val();
                              }                           
                         },
                        dataType:"json",
                        dataFilter: function(data) {
                            var json = jQuery.parseJSON(data);
                            if(json.error == "true") {
                                return "\"" + json.errorMessage + "\"";
                            } else {
                                return success;

                            }

                        }
                    }

                }

This function check the uniqueness of a username and returns an error if not unique. The issue is that the remote method won't make any additional calls after being valid.. I need it to trigger every time a value is entered/changed.

For example, if I enter 3 non-unique usernames, the call is made every time. If I enter a unique username, the call is made correctly and the username comes back as valid. So the field is then valid. Now if I enter another non-unique (invalid) username, the remote method won't trigger again.

Wondering if it's somehow caching the response?

invalid (non-unique) response:

{"error":"true","errorMessage":"<b>The User Name you chose is already in use.</b>  Please enter another name."}

valid (unique) response:

{"error":"false","errorMessage":""}

Edit

Saw this on SO:

https://stackoverflow.com/a/1821667/335514

$("#site").change(function() {
  $("#email").removeData("previousValue");
});

So the plugin seems to be caching the response. Does the plugin have a method to switch off caching, or would adding a cache: false to the ajax call do the same thing?

Edit

Neither of these methods worked. It appears that once a field is marked valid, it won't make the remote call again. Thoughts on how to fix? Would putting the function into it's own addMethod prevent this scenario?