It turned out to be a big problem when a friend somehow put the Refresh Rate higher than what his monitor could support(He claims that he put 170 Hz). I don’t know how he did it since my monitor can only reach 60 Hz and ingame I can only set it to 60.
After he done that, his game closed and when he tries to enter, it keep saying: “Entrance not supported” and now he is reinstalling GW2 and I will only be able to play tomorrow.
For emergencies like that, it’s good to have configurable settings on the launcher or in the directory of the game.