I checked with Clayton yesterday and he gave me these instructions to change back to the screen you had previously. I did it successfully. You have to log-in first and then follow his instructions. After you do it, you will find that when you come in as a guest, you will still see the black default theme but after you log-in, you will see the original screen each time. Hope this helps.
I also notice that the birthday list went crazy again - I think this happens when an update is done - it's happened before.
FROM CLAYTON'S EMAIL:
This is an update to the default theme. You can change this to any previous theme by clicking the "Profile" tab at the top and clicking "Look and Layout" at the top. Click "change" next to the theme name and pick any previous theme.