Vertical Scroll Problem?

I don't know if this is a bug, but when I try to use scrolling in the following example, I get no data showing up at the first time and data but a never ending load dialogue on the second call. My code looks as follows:

// this code works fine

oTable = $('#datatable').dataTable({
				    "bProcessing":true,
			        "bServerSide":false,
			        "sAjaxSource":"/reprocessing/show",
			        "bDestroy": true,
			        "bFilter": false,
			        "fnServerParams": function ( aoData ) {
			            aoData.push( { "name": "some_name", "value": "some_value" } );			        
			        },
			        "sDom":"frtlip",
			        "oLanguage":{
			            "sUrl":"/languages/" + language.toLowerCase() + "_datatable.csv"
			        },
			        "iDisplayLength" : -1,
			        "fnDrawCallback": function () {
			            if(this.fnSettings().fnRecordsTotal() > 0)
						  $('#bottom_options').show();
						else
						  $('#bottom_options').hide();
			           
			            $('#datatable_length').hide();
			            $('#datatable_info').hide();
			            $('#datatable_paginate').hide();
			        }        
			 });

// this code is not working correctly as described above

oTable = $('#datatable').dataTable({
				    "bProcessing":true,
			        "bServerSide":false,
			        "sAjaxSource":"/reprocessing/show",
			        "bDestroy": true,
			        "bFilter": false,
			        "fnServerParams": function ( aoData ) {
			            aoData.push( { "name": "some_name", "value": "some_value" } );			        
			        },
			        "sDom":"frtlip",
			        "oLanguage":{
			            "sUrl":"/languages/" + language.toLowerCase() + "_datatable.csv"
			        },
			        "iDisplayLength" : -1,
                                "sScrollY": "200px",
				"bPaginate": false,
			        "fnDrawCallback": function () {
			            if(this.fnSettings().fnRecordsTotal() > 0)
						  $('#bottom_options').show();
						else
						  $('#bottom_options').hide();
			           
			            $('#datatable_length').hide();
			            $('#datatable_info').hide();
			            $('#datatable_paginate').hide();
			        }        
			 });

Thank you in advance for your help.

Best Regards,
moe