Got the same issue now. from one day to another with no change to my computer.
OK solved this now. I uninstalled and then I made sure to delete all files left in the Atlas folders.
I noticed that when I chose servers, the filter was still on favourites.
Installed again and then I had to start the game one time with low memory settings and all graphics set to low.
Because at first I got stuck on a black screen. Now it's actually working.