I built my Nether Reactor just like normal, but this time, I had it one block off the ground. I expected it to react like normal. I activated it, then mined 3 of the 4 gold blocks, like I always do. Then, I removed the active core, like I used to in 0.5.0 and 0.6.0. Usually, it still spawns items for the usual 45 seconds, then I mine my way out. But this time, nothing ever spawned. I mined out and left without any drops. 0.6.0 is the first update to do this for me.