I currently use heavily extended AS2 (including RotaryCraft and Calculator), but I noticed the error in a fresh installment. When I used my Signalum pickaxe before leveling it up to Cobalt level (Signalum starts at Ardite), I noticed that I could mine Nether diamond ore (marked "Mining Level: Manyullyn") and Ardite ore too, but not Cobalt ore. After leveling the pickaxe up and getting some Cobalt, I made a Manyullyn pickaxe, but it couldn't mine Ardite nor Cobalt ore. It was on 1.1.7, but do any of you get it in the latest version?