In Yahoo YUI 2.5.2 the Yahoo DataTable editorSave Event’sData Cell Editor has changed. To get to the data record for the editor it is no-longer oArgs.editor.record, but rather oArgs.editor.getRecord();
DataTable.subscribe("editorSaveEvent", EditorChanged);
function EditorChanged(oArgs)
{
var record = oArgs.editor.getRecord();
}