previous and next links not working in gallery

solved – uploaded the nextgen gallery optimizer and works, the nextgen gallery must not have a lightbox plugin

The last Nextgen versions have some native lightbox effects, and all works fine.
What you had before, shutter, and also what you have now, are natively present in the plugin. If they didn’t work was because of something else (you should have done some debug), not because they are absent in the plugin. Look in the options.