Another possibility is that the world didn't install correctly. You could try downloading from your purchase history again; and then, remove the .ebc file that BB installed into and try installing again.
In the installedWorlds folder, it should show BB.world; so this, I assume, is were it says BB.object.
In the worldCache folder, it should show BB_objects after you've played the world.
However, did you try going into the game and seeing if the world installed? Can you pick it from the list of worlds and enter it?
I THINK I have some worlds in my purchase history with the code redemption and free designation too. It probably helps with EA's auditing to know that you didn't purchase directly from the store.
