I actually found the solution…
I had to remove something in the code that was loading a sidebar…
(because I’m also using Pluto theme from Envato Market)
Anyway problem solved 😀
Actually the problem was coming from my WordPress Theme, not the plugin… ^^
I have the same problem, I install the lightbox gallery plugin and all I got is a classic wordpress gallery opening images in a different page…
http://www.alexis-srmjn.fr/char-design/
Thanks for helping us
