Cannot use the furnace on survival mode on Minecraft 0.7.0. To replicate this, open a furnace to use it. You may place an object in the box for the item you desire to be smelted. The other boxes are non responsive on touch and you cannot obtain your items that were finished in the furnace prior to 0.7.0. For example if I had smelted iron ore in 0.6.1 and there is iron ingots completed, I cannot click the iron ingots to obtain them in 0.7.0. The only workaround is to break the furnace to get your items back, but no new items can be smelted currently. Running Android 4.1.2 on a Samsung Galaxy Victory.