PrettyPhoto not working

Hello,
I’ve tried the shashin plugin on my website to whow some picture.
I can see the albums on this page http://www.mylittleroad.com/galerie-photos/
and then when i click i can see the pictures but i can’t go from one picture to another one !
I guess i have to change something in the prettyphoto settings ?
Is it possible to have a conflit with my theme which is simple mag ?
Thanks for the help
Solène

https://wordpress.org/plugins/shashin/