This code renders a grid:

$("#igGrid").igGrid({
  autoGenerateColumns: false,
  columns: 
      [
          { headerText: "Barcode", key: "Barcode", dataType: "string" },
          { headerText: "Court Description", key: "CourtDescription", dataType: "string" },
          { headerText: "Case Type Description", key: "CaseTypeDescription", dataType: "string" },
          { headerText: "Date Filed", key: "DateFiled", dataType: "date" },
       ],     
    fixedHeaders : true,
    width : '100%',
    height : '250px',
    responseDataKey : 'Rows', 
    dataSourceType : 'json',
    dataSource : result.d.JSONData
 });
If I turn on autoGenerateColumns and remove the column property then I get a grey block with no data.

Here is what result.d.JSONData looks like:
{"Rows":[{"Barcode":"00a00-0000-aa-000001","CourtDescription":"(None)","CaseTypeDescription":"(None)","DateFiled":"\/Date(1314939600000-0500)\/","Tracking_ID":"7ca96f89-32d5-4203-9bc6-772157175d91","DateClosed":null,"DateReinstated":null,"DateDismissed":null,"StatusDescription":"(None)","Names1TypeCode":"AD","Names1":"Pete","Names2TypeCode":"WD","Names2":"Mike","Comments":"Other Comment"},{"Barcode":"11A11-1111-AA-111111","CourtDescription":"C01","CaseTypeDescription":"AD","DateFiled":"\/Date(1313816400000-0500)\/","Tracking_ID":"598d02db-88a4-40e8-beda-4c1d517433fc","DateClosed":null,"DateReinstated":null,"DateDismissed":null,"StatusDescription":"Open","Names1TypeCode":"DC","Names1":"Test","Names2TypeCode":"TR","Names2":"test 2\ntest 3","Comments":null},{"Barcode":"11A11-1111-AA-111112","CourtDescription":"D02","CaseTypeDescription":"TR","DateFiled":"\/Date(1314939600000-0500)\/","Tracking_ID":"7f70fb59-80ad-4973-8b99-b6f5ca00482e","DateClosed":null,"DateReinstated":null,"DateDismissed":null,"StatusDescription":"Open","Names1TypeCode":"WD","Names1":"W: 1\nD: 2","Names2TypeCode":"DC","Names2":"D: A\nC: B","Comments":"More stuff to type."}]}
 
I have this on my page:
	<b>Start</b><br />
	<table id="igGrid"></table><br />
	<b>End</b><br />

If I understand autoGenerateColumns it should take the JSON data and pull out the column names and use them: "Barcode", "CourtDescription":, ...