I just experienced the same problem… the problem is the line
$galleryID = (int) $galleryID;
in the function nggShowGallery (nggfunctions.php). If you remove this line, gallery names will work again. However, I’m not exactly sure whether there are any side-effects.
According to this ticket, this is a wanted behaviour. The developer of the plugin writes that “this is a older shortcode which is no longer supported”.
