I don't know what might have caused this for sure, so how I think this came up might be off a bit.
I generated a customized world (with the new world customization stuff),
I set default gamemode to creative in the world generation options,
I build for a bit, and I drink nightvision potions so I can see at night and underground when I work with my builds.
The potion effects wear out, so the nightvision goes away.
I log out of the game.

I come back later and log back on, and now I see every block like all sides are lit with light level 15. I go to inventory, and the nightvision tab is not there. There are no particle effects. I try changing video settings, nothing happened with the lighting. I try changing gamemodes, but that didn't do anything either. I try drinking another nightvision potion, I get the tab, the potion wears off, but I still see like I still have nightvision.
Another problem is this is spread to ALL my saves, no matter the gametype, no matter if the world was made before this problem showed up or if it's a newly generated world.

Like I said above, I'm not sure what I did exactly to cause this problem, and therefor cannot give accurate procedures to reproduce this. I will make a guess and say it might be logging off while the potion is in effect.