Phone - iOS - iPhone 5
When I Heard that fire was in the update I was so happy so I go into my world and got some Flint And Steel and lit some fire.
What I expected to happen was that the fire burns red.
I lit the fire using Flint And Steel and it was completely black in my friends case only one tenth of the fire was showing (but not black)
THE FIX: When Fire is lit, go out of the game and kill MCPE from the task bar then go back in and done. (Worked For Me
Steps to Reproduce:
1. Get a fresh new MCPE (update to 0.7.0) or (I'm guessing also deleting and reinstalling MCPE works).
2. Go To Survival
3. Light Fire (And you might not see what I saw like black fire it's different for people).
CAN BE DONE IN CREATIVE SINCE LAVA SPREADS FIRE!!