The problem occour even i select a single category.
With "developer error message" i can see
Fatal error: Using $this when not in object context in /home/var/www/gialdi.quantility.it/administrator/components/com_virtuemart/models/category.php on line 121
public function getChildCategoryList($vendorId, $virtuemart_category_id,$selectedOrdering = null, $orderDir = null, $cache = true) {
if($selectedOrdering===null){
//$selectedOrdering = VmConfig::get('browse_cat_orderby_field','category_name');
$selectedOrdering = $this->_selectedOrdering;
}
if(!in_array($selectedOrdering, self::$_validOrderingFields)){
$selectedOrdering = 'category_name';
}
if($orderDir===null){
//$orderDir = VmConfig::get('cat_brws_orderby_dir', 'ASC');
$orderDir = $this->_selectedOrderingDir;
}
if i comment the row with the "$this" all works!!!
found a bug, debugged, bypassed the error... now i hope in a fast release of solution please :-(