Currently it seems impossible to play loaded multiplayer games. To reproduce simply:
1: Host a game on either LAN or Battlenet with another person in the game as well.
2: Save the game and quit
3a: Loading the game in LAN works but any person attempting to join will have their game crash.
3b: Loading the game on Battlenet simply doesn’t work, it just hangs after clicking “Load Game” when you try to host it.
Is there any time frame as to when this bug will be fixed?