[Plugin: NextGEN Gallery] Random slideshow

I have clicked random in the option but the slideshow starts from the same image and the following images are always in the same order. I want the slideshow to be fully random.
When you go onto the slideshow page it should be random and when you click next image it should be random.

how can I do this?

Thanks very much!

http://wordpress.org/extend/plugins/nextgen-gallery/