When arriving in a city to complete a quest I clicked on the cards in the pile on my screen as I arrived. This caused the game to freeze the animation of the cards blowing up and wouldn't allow me to click on anything other than the chat and exit button. When I clicked the exit button it gave me the ability to click the action buttons but nothing could be seen on screen. I had to use task manager to close the game. I forgot to take a screenshot so sorry about that.