While upgrading to the 2015.1 igCombo our app started throwing the error "Error in bindDataError: Operation not supported". I tracked it down to the enableClearButton property. It is still in the API did something change with this property that wasn't documented in the migration notes? Example below:

var bindCombo = function (node, nodeData) {

var $table = $("#" + node);

$table.igCombo({

dataSource: nodeData, //JSON Array defined above

textKey: "DisplayText",

valueKey: "Identifier",

mode: "editable",

enableClearButton: false,

selectItemBySpaceKey: true,

initialSelectedItems: [{ index: 0 }]

});

};