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If the person who created a new game (room, lobby) leaves it, the leadership is passed to another player. That player cannot start the game (he does not get "Start Game" button in his interface).
I observed this problem several times in the practice lobbies.
1. Clicked on "PLAY" to start new game
2. Selected practice game
3. Created new game
4. After several people joined, quit the game
5. Upon rejoining, found the chat buzzing with 9 people shouting "start the game" and the new game leader responding "I don't have the button to do it"