Out of six cubes, I had one with a bad blade-- it showed a row of "xxx"s no matter which slot I put it in. I emailed asicminer.help@gmail.com on Dec. 6 about the single defective blade, and received no response.

Then I got home today and there was a package inside my door from Shenzhen. I actually thought to myself, "What the heck is this? I haven't ordered anything recently." But there was a replacement blade inside, and it works perfectly.

4 days, including the weekend, from the moment I emailed until the replacement blade arrived from China and was plugged in & hashing. Amazing. Amazing! Thank you CanaryInTheMine & friedcat. The ASICMiner legend grows.