Hello, I encountered this bug a few times and it seems to trigger when I choose the main menu option in game and then try to reload my game from the main menu. The introduction dialogue plays again but this time over the picture of the idol, after the dialogue has finished the image persists, you can still click the pause/play buttons however none of the other options are accessible.
Getting the same issue as well, although I never quitted to the main menu, I saved and closed the game altogether. Now whenever I click on continue, the game does the same thing it does to you: Plays the intro and then gets stuck. Judging from the budget shown down below, I guess it reset everything.
Shame to lose my old save but it ain't the end of the world.