I've done basic lighting before, and in theory made it look decent, and always in the past it was very very easy for me to do. But now, for whatever reason, I cannot click okay after clicking apply to lighting, it's just stuck the way it is in this mod, and I don't know why. I change the lighting template to a custom one, and even to none and it does nothing.

It's as if some setting I don't understand has locked, and greyed out the "Okay" button to confirm changing lighting. Any idea what is going on? I'd be thankful for any help with this baffling problem.

http://i.imgur.com/9kQUTCi.png

Edit: Nevermind, for some reason I must select another cell, then select the cell I want to alter, why this is I don't know but it fixes the problem.