Furnace bug. You can't select

When I went to go smelt iron into ingots it wouldn't let me select the place where wood goes. This is NOT good. Now i can't start any new worlds and get them good. (No nether reactors!)

What I expected to happen was...:
For me to be able to smelt.

What actually happened was...:
It wouldn't let me put any wood in

Steps to Reproduce:
1. Just try to cook something
2. ...
3. ...