Furnaces don't allow placement of fuel or retrieval of anything

When attempting to use a furnace, I can place blocks to be smelted into them, but cannot retrieve blocks that have been placed in the furnace. I cannot put fuel into the furnaces. Furnaces that already contained smelted blocks at the time I updated to 0.7.0 don't allow retrieval of the smelted blocks. This applies to all furnaces in existing games and games created with 0.7.0.

Steps to Reproduce:
1. Make a furnace
2. Put blocks in the smelting area
3. Try to do anything else with the furnace

My iOS version is 5.1.1. I tried closing all apps and restarting the phone.