The problem is fixed, we’ve removed: sanitize_file_name() not sure if this will cause any new problems, but it works for the time being.
in /image-store/_inc/galleries.php:
$this->galpath = “/” . trim( sanitize_file_name( $_REQUEST[‘folderpath’] ), “/” );
to:
$this->galpath = “/” . trim( $_REQUEST[‘folderpath’] , “/” );