After I have played a game against the computer, I sometimes want to review the game and habitually press Ctrl-Z (instead of using the arrows.) This is a problem because you can't redo the moves after you've undone them. This would be a minor issue, except because the pieces have been moved, it asks you if you want to save or abandon the game when you try to exit or create a new game. No matter what button you press, the next time you open the application, it will present the saved game to you, every single time, until you go into .local/share/glchess and delete the .pgn file manually.