Found it at http://mappresspro.com/mappress-beta#toc-settings.
Changed to the required “center” array format instead of “center_lat” and “center_lng”:
$mymap = new Mappress_Map(array(“width” => 300, “height” => 200, “zoom” => 13, “posts_per_page”=> -1, “overviewmapcontrol” => false, “maptypecontrol” =>false, “marker_body” => “none”, “marker_link” => true, “marker_title” => “post”, “poilist” => false, “center” => array(“lat” => $cblat, “lng” => $cblng)));
It works!