If you are in a custom lobby, and someone sends a message that is close to the character text limit then it will glitch the lobbies screen and it will stop the host from being able to click the start button. I recently experienced a troll who spent 15 minutes spamming every customer game lobby earlier. Finally, once we coordinated ourselves we were able to start a lobby by banning the player, but it was an unnecessary thing that had to be done. please fix this.
Here I posted a video about this gamebreaking bug. https://youtu.be/fjjVxTkSjws
made a fix for it while we wait for an official blizz response:
https://us.forums.blizzard.com/en/warcraft3/t/200-sending-large-chat-messages-breaks-ui/33418/4