Three times in the past few hours, I've had mobs I was fighting inexplicably turn or stay yellow. I was fighting a raptor and it turned yellow as soon as Hojo finished, and twice I've had flies fail to turn red when I pulled them (One stayed yellow the whole time, one turned red for a split second then returned to yellow). No issues with other people having hate or aggro in any of these cases.
I know these kind of issues pop up once in a while, but these are the first three times it's come up for me, all in a very short period of time. Is this another maintenance in the making?