Defeated Bartuc on Torment 1 Infernal Horde, should have unlocked the Alter the Balance chaos perk, but still shows as not yet unlocked. Restarted the game and re logged into my character.
Yeah, I just did my first Bartuc fight on T2, with no Unique Chaos perks unlocked - nada.
Not exactly cool, when that fight is a bit of an annoyance as it is. =/