fnServerData,bServerSide and sAjaxDataProp

Hi there,

I'm trying to use fnServerData to get around the cross-site scripting stuff, but dataTables is staying in 'processing' mode forever when I add it. FYI, bServerSide is set to false and sAjaxDataProp is set to empty. I can see that the API is being called properly, data is retrieved and fnCallback is even called, but there is something I am missing... Any help would be appreciated.

				$('#table_sites').dataTable( {
					"sDom": "<'row-fluid'<'span4'l><'span4'T><'span4'f>r>t<'row-fluid'<'span6'i><'span6'p>>",
					"bProcessing": true,
					"sAjaxSource": 'http://mysite/api/site/list',
					"sAjaxDataProp": "",
					"fnCreatedRow": function( nRow, aData, iDataIndex ) {
						$(nRow).attr('id',aData["_id"])		//need this because server side data does not include DT_RowId
					},
					"fnServerData": function( sUrl, aoData, fnCallback, oSettings ) {
						oSettings.jqXHR = $.ajax( {
							"url": sUrl,
							"data": aoData,
							"success": fnCallback,
							"dataType": "jsonp",
							"cache": false
						} );
					}
				} );

returned from server :

[{"_id":"ID:50d214c23b8e77804000000d","name":"patati142","type":"general","version":"1.0","theme":"valencia-dark","created":1355945154,"modified":1355945154,"lang":"en-CA"},{"_id":"ID:50d214b83b8e77ac4100000a","name":"patati16","type":"general","version":"1.0","theme":"valencia-gray-black","created":1355945144,"modified":1355945144,"lang":"en-CA"},{"_id":"ID:50d212e73b8e77824000000c","name":"patati14","type":"general","version":"1.0","theme":"client-eiffelv2","created":1355944678,"modified":1355944704,"lang":"en-CA"},{"_id":"ID:50d2123e3b8e774b40000006","name":"patati13","type":"general","version":"1.0","theme":"client-ambassadeur","created":1355944509,"modified":1355944517,"lang":"fr-CA"},{"_id":"ID:50d2120d3b8e777e40000009","name":"patati12","type":"general","version":"1.0","theme":"client-createursaveurs","created":1355944460,"modified":1355944508,"lang":"fr-CA"}]