Same thing when I want to start a new game, it doesn't work too. I can create the caracter, then stucked on the loading page.
I would like to uninstall and reinstall the game, but don't know how to do and don't want to download again a bunch of gigabites !

I can see than under the crown, on the bottom left of the page, witch is the way to know if the game is loading, there is no progression and I can read 'Null' under the crown. Same for you guys ?

Thanks a lot, Ilona, all stuff is working again.
You were of great help.

When you rollback the game Galaxy scan the files in your install folder and download only some selected files that are different from the repository (for a given game version).

The same goes for updating to the newest version. Only some, new files are being downloaded, not the whole game. The size of downloads depends on how much files have changed for a given version. You don't have to download anything manually. Galaxy will do this automatically when you hit install update button.

Once you rollback your game to the older version, Galaxy will inform you right away that there is an update available.
Keep an eye on patch notes (you can read patch notes in Galaxy by clicking on the game version number to the right of MORE button) to decide yourself whether you want to update or not.
At any time when you decide to update the game (if /when the newer version is available ) just click on the blue More button and select update now.

You can also enable or disable automatic updates for a given game in Override Features section. You are welcome. I am glad I could help.