I know there were tons of reports about this bug recently, but still, this bug was supposed to be fixed in this snapshot but it's still there.
My crossfire is a negative colored square. At first I thought my Resource pack was the problem, but I realized this bug happens on every other RP.
I also noticed that sometimes it goes back to normal upon opening containers or placing certain blocks like torches or stone bricks. Though
I'm not sure if this is just a RP related bug or in Default too. I'm currently using ''Faithful 32x32 pack for snapshot 14w25a''.
It isn't world related either since it happens in every saved world.
I hope this bug can be fixed soon, since its quite annoying.

Thanks for reading!