This has happened 3 times. I'll finish a mansion, get the screen that tells me money, percentage of secrets, etc. Then when I click the mouse to exit that screen, I get what's in the pic. But then when I click again, it goes back to normal and I get the submit high score dialog box.
Correction: the weird screen in the pic is there with the dialog box for submitting your high score. Then it goes back to normal after you exit the dialog box. It doesn't happen every time, but it happens often.