What I expected to happen was...:
For it to change the "Super Secret Setting" to something.

What actually happened was...:
It did work, but the whole sky was black and everything was lit up (like no darkness at night etc...

Steps to Reproduce:
1. Set Render distance to 2 chunks.
2. Click on the "Super Secret Settings..." Option.
3. And then the whole sky is black.

Things to note;
I've tried this on all different types of (filter?) types, and it all does the same thing.
Also, if you try it again on anything higher than 4 chunks, there will be a big black line in the horizon.