Jquery Autocomplete not working in 1.5.1 but worked in 1.4.4

The following autocomplete code works with Jquery 1.4.4 but not with 1.5.1. I am using jquery-ui-1.8.11. I use the selected item to populate an array, the alert() call is just for testing purposes. I aware of an autocomplete bug in 1.5 but thought 1.5.1 fixed it. Any ideas on what I should do to get this working in 1.5.1? My guess would be so开发者_如何学JAVAmething with the json results, which are listed below.

$("#selected").autocomplete({
    source: function (request, response) {
        $.ajax({
            url: autourl, type: "POST", dataType: "json",
            data: { query: request.term, maxResults: 10, donationid: donationid },
            success: function (data) {
                response($.map(data, function (item) {
                    return { Label: item.Label, value: item.Label, VolunteerID: item.VolunteerID, DisplayName: item.DisplayName, QtyFilled: item.QtyFilled }
                }))
            }
        })
    },
    select: function (event, ui) {
        alert(ui.item.DisplayName);
    }
});

The following is returned for 1.4 and 1.5.1. [{"VolunteerID":1,"Label":"John Smith (jsmit@domain.com)","DisplayName":"John Smith","FirstName":"John","LastName":"Smith","AliasName":null,"QtyFilled":0}]

Are you by chance using the validator plugin? There is a conflict between a previous version of the validator plugin and any 1.5.x jquery plugin. Downloading the updated validation plugin worked for me.

https://github.com/jzaefferer/jquery-validation

If this wasn't the issue, try removing any extensions and trim down the code so all you have left is the autocomplete code.

You can try it with jQuery v1.5.2 - hot off the press: http://blog.jquery.com/2011/03/31/jquery-152-released/