Openlayers - Vector layer polygon doesn't move in-synch with Google V3 baselayers

When a polygon is drawn on the map and the map is dragged, the position of the polygon relative to the GM V3 base changes.

function init() {
    var map = new OpenLayers.Map('map');
    var gsat = new OpenLayers.Layer.Google(
        "Google Satellite",
        {type: google.maps.MapTypeId.SATELLITE, numZoomLevels: 22}
    );

    drawVctr = new OpenLayers.Layer.Vector("Editable Vector");
    map.addLayers([gsat, drawVctr]);

    // Google.v3 uses EPSG:900913 as projection, so we have to
    // transform our coordinates    
    var lng = "-71.118004"; 
    var lat =  "42.389118"; 
    map.setCenter(new OpenLayers.LonLat(lng, lat).transform(
        new OpenLayers.Projection("EPSG:4326"),
        map.getProjectionObject()

    ), 19);
    drawPlygn = new OpenLayers.Control.DrawFeature(
        drawVctr,
        OpenLayers.Handler.Polygon
    );      
    map.addControl(drawPlygn);
}