Netherrack does not cook into bricks inside of furnaces. I had noticed that my furnace was cooking non-stop (like it should, its an auto-smelter specifically for this task) but when I would check the chest that it feeds into that there would be no finished product. I checked the hoppers, the chest, made sure it wasn't a render glitch that the bricks were there but not loading the number. And then when I checked the furnace itself, the progress bar to show that it was cooking did not move, but it kept feeding itself coal blocks as if it was working.
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I don't know if it matters but I realized I forgot to mention that it is occurring on a Survival Multi-Player server.
I swapped out the Iron ore with Netherrack and it is now producing Nether brick ingots. Not sure what caused this issue, however it seems to have resolved itself.
Alright will close as invalid for the time being. If you can reproduce it consistently, leave a comment with info.
I've just had a similar problem.
14w19a Single Player
Windows XP (32 bit)
Java 1.7.0_55-b14
Chest full of Netherrack/Hopper/Furnace/Hopper/Chest with a side Hopper for Lava Buckets.
The Furnace burnt the Lava Buckets, but failed to produce Nether Brick.
Emptying all the inventories, then refilling them has (currently) fixed the Furnace.
Unable to reproduce. Are you certain the furnace is actually smelting?