Lego Movie game - 2nd controller configuration not being saved

I have been playing the Lego Movie game on my Windows 7 PC fine for a while. However, recently the 2nd player controller configuration is not getting saved.

Every time I go back to the control configuration, it says "no device selected". When I choose "change device", I am able to correctly add a device (i.e., the game goes detect the keyboard or gamepad), but when I accept and go back to configuration, it is back to "no device selected".

I can save video settings changes. I also tested whether the controller I was using for the 2nd player works for the 1st player, which it does and also gets saved properly. I tried running in Administrator Mode and it did not make a difference.

In other saved games, I can change the 2nd player controller and that works fine. In my saved game, I can change the 1st player controller and that works fine. But I am unable to change the 2nd player controller (even to keyboard, which does not save).

I was looking for some (perhaps corrupted) configuration file that I could delete.