Try to use SVG render with IE9 and get an error: "Your browser does not support vector rendering". OpenLayers breaks on 558 line of addFeatures method in Vector.js file: "this.renderer.locked = true;" - is null or undefined. The way I use for adding layer: var geojson_format = new OpenLayers.Format.GeoJSON(); map_vector_layer = new OpenLayers.Layer.Vector("", {styleMap: sm, rendererOptions: {zIndexing: true}}); map.addLayer(map_vector_layer); map_vector_layer.addFeatures(geojson_format.read(regions));
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