How do you leave a game without having to log off?

Whenever I play Dominoes or Hearts, I have noticed that if you need to leave the game, there is no longer an X in the upper right corner to X out of the game. The only way I can find to leave the game is to signoff. I don't want to signoff. I want to change to another game. This has been happening for about two weeks now. Some programmer goofed.