Here's a sample grid and subgrid I've tested this with. Unfortunately I can't provide you with an online link. Below are my comments and a potential fix. I hope this helps.

$(document).ready(function () {

var lastsel2;

$(“#list”).jqGrid({

url: '/GridData/',

datatype: 'json',

headertitles: true,

mtype: 'GET',

postData: {},

colNames: ['ID', 'Name', 'Last Start Time', 'Last Loop Time', 'Last Stop Time', 'Last Fail Time'],

colModel: [

{ name: 'ID', index: 'ID', key: true, width: 40, hidden: true, editable: false, sortable: true, sorttype: 'integer', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} },

{ name: 'Name', index: 'Name', width: 250, hidden: false, editable: false, sortable: true, sorttype: 'text', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} },

{ name: 'LastStartTime', index: 'LastStartTime', width: 150, hidden: false, editable: true, sortable: true, sorttype: 'date', datefmt: 'y-mm-dd h:i:s', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} },

{ name: 'LastLoopTime', index: 'LastLoopTime', width: 150, hidden: false, editable: false, sortable: true, sorttype: 'date', datefmt: 'y-mm-dd h:i:s', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} },

{ name: 'LastStopTime', index: 'LastStopTime', width: 150, hidden: false, editable: false, sortable: true, sorttype: 'date', datefmt: 'y-mm-dd h:i:s', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} },

{ name: 'LastFailTime', index: 'LastFailTime', width: 150, hidden: false, editable: false, sortable: true, sorttype: 'date', datefmt: 'y-mm-dd h:i:s', search: true, stype: “text”, searchoptions: { sopt: ['cn', 'bw', 'eq', 'ne']} }

],

onSelectRow: function (id) {

if (id) {

if (id != lastsel2) {

$('#list').jqGrid('saveRow', lastsel2);

$('#list').jqGrid('restoreRow', lastsel2);

$('#list').jqGrid('editRow', id, false);

lastsel2 = id;

}

else {

$('#list').jqGrid('saveRow', lastsel2);

lastsel2 = -1;

}

}

},

height: “100%”,

ignoreCase: true,

imgpath: '../../Scripts/jQueryUI/css/cupertino/images/',

loadonce: true,

loadui: 'block',

multiselect: true,

refresh: true,

reloadAfterSubmit: false,

rowList: [-1, 10, 20, 50, 100],

rowNum: 20,

shrinkToFit: false,

sortable: false,

sortname: 'ID',

sortorder: “desc”,

subGrid: true,

subGridRowExpanded: function (subgrid_id, row_id) {

AddSubGrid(subgrid_id, row_id)

},

toppager: true,

viewrecords: true

});

function AddSubGrid(subgrid_id, row_id) {

var subgrid_table_id;

subgrid_table_id = subgrid_id + “_t”;

jQuery(“#” + subgrid_id).html(“

“);

jQuery(“#” + subgrid_table_id).jqGrid({

url: 'SubGridData' + '//' + row_id,