Get stuck at the "lion gate" screen

This started a day or two ago for no apparent reason. When I try to launch the game, it’s stuck at the “lion gate” screen. It doesn’t get past it at all no matter how long I wait. I also can’t launch the game or world editor directly, it only works when doing it through the battle.net app.

I tried:

  • Shutting down my computer and waiting a while before starting again
  • Reconnecting to WiFi, renewing/releasing and flushing DNS
  • Completely uninstalling the battle.net app and making sure all files registry info is removed before installing again
  • Running every related .exe as administrator, giving my account full permissions for every related .exe, taking ownership of all folders
  • Some other stuff I’ve forgotten

Didn’t change router settings, also tried on a neighbour’s wifi, same thing still happens. Also tried turning off Windows antivirus and firewall, still the same thing.