When attempting to change the furnace slots to add different items, it does nothing. Also you can't take anything out of a furnace unless destroyed.
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Duplicate, please use the search function to see if your bug has already been submitted. Currently over 60% of tickets are being closed as duplicate.
Having the same problem on my iPad 1st generation (OS 5.1.1). Have seen a large number of people also reporting/discussing this. Makes the game all but unplayable. Can place material, but not fuel. Cannot remove placed material without destroying furnace.