you mean this? it only appears in the afternoon and evening, and only when it says who won and who lost, I try to click on it and nothing happens. And at night, it doesn't occur at all, even with dialogs and notifications.
that's the icon. you probably need to talk to the girl who sells secrets for height in the casino in order to unlock being able to acess it. As for you seeing it during afternoon that's more of a visual bug apparently.
