Blank pages when try to change

Canot change any page of my JDR, if i do it become blank page ?

Hi Royii,  What is "JDR"? Could you provide more information? 

JDR is French for RPG: "jeu de rôle" In this context, my assumption is that it refers to a Roll20 game. If I've interpreted correctly. Royii, I would suggest deleting cache and cookies, and also trying a private/incognito window. If you have access to a different device to test on, that would also be helpful. If that doesn't help, some questions: Is this a game you have recently brought out of deep freeze? Is the game based on a published module from the Marketplace?