Even though I have the arcane blacksmith perk, I am unable to upgrade the dark brotherhood shrouded armor, the ancient shrouded armor nor the thieves guild master armor.
It still says I must have the perk to be able to upgrade them.
Removing, re-adding the perk doesn't do it, neither does giving myself a new set of armor.
I can upgrade other enchanted armor just fine (such as the normal thieves guild armor).