In 0.7.0 you could not access the fuel for the furnace in survival.

Put the summary of the bug you're having here

*What I expected to happen was...: I could smelt iron or any ores
Describe what you thought should happen here

*What actually happened was...:you could only access was what you wanted to smelt.
Describe what happened here
You could not access the fuel box.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ... Mine to get the ore in survival and get a furnace.
3. ... Get ore in top and then you can not smelt because the fuel box is not accessible.