IE8 only shows circa 150 lines

lib

Hi,

In Firefox (also in Opera pre-webkit) DataTable shows all lines of output, which may go up to some thousands.
Problem is that I have to make this work with IE8 and IE8 only shows circa 150 lines. They're all loaded, because when I sort them in the opposite direction I can see lines previously not shown.

Changing bDeferRender to false doesn't mitigate the problem.
Is there anything I can check?

  var table = $('#tbl_resultados').DataTable( {
        "bProcessing": true,
        "sAjaxSource": "/apls/indicadores/indic_acess.php",
        "bServerSide": false,
        "bJQueryUI": true,
        "sServerMethod": "GET",
        "bDestroy": true,

        "sScrollY": "420px",
        "sDom": 'T<"clear">C<"clear">frtiS',
        "bDeferRender": true,

        "fnServerData": function ( sSource, aoData, fnCallback ) {
            request = $.ajax({
                "dataType": 'json',
            "type": "GET",
            "url": sSource,
            "data":{
                "fn": "lines",
            "hierarquia": hierarquia,
            "caes": caes,
            "indic_periodos": indic_periodos
            },
            "success": fnCallback
            });
        },
                                                                                                                                            
        "oTableTools": {                                                                                                                    
            "sSwfPath": "/javascript/datatables/extensions/TableTools/swf/copy_csv_xls_pdf.swf"                                             
        },                                       
                                                                                                                                          
        "aoColumnDefs": [                                                                                                                   
        { "bVisible": false, "aTargets": [ 0, 2, 13, 14, 15, 16 ] },                                                                        
        { "sClass": "right", "aTargets": [ 0, 6, 7, 8, 9 , 10, 11, 12, 13, 14, 15 ] },                                                      
        { "sClass": "left", "aTargets": [ 2 ] },                                                                                            
        { "sClass": "center", "aTargets": [ 1, 3, 4, 5, 16 ] },                                                                             
        { "sType": "string", "aTargets": [ 2, 5 ] },                                                                                        
        { "bSearchable": false, "aTargets": [ 0,4,5,6,7,8,9,10,11,12,13, 14, 15, 16 ] },                                                    
        { "sClass": "dt1",  "aTargets": [ 1 ] },                                                                                            
                                                                                                                                            
        { "sWidth": "18px", "aTargets": [ 2 ] },                                                                                            
                                                                                                                                            
        { "mRender": function ( data, type, row ) {                                                                                         
                return "<a target=_blank href=http://localhost:8000/apls/cg.php?n=" + data + ">" + data + "</a>";
              }, "aTargets": [ 1 ]
        }
    ],

        "createdRow": function ( row, data, index ) {

            if ( data[13] === "1" && data[14] === "1") {
                $('td', row).addClass('cnd');
         (... and others)
        },

        "aoColumns": [
        { "sTitle": "id" },                                                                                                                 
       (... and others)
            ],
              
        "language": {
            "decimal": ",", 

lib

No ideas about this problem? Is it only a problem of mine?