Adding abilities after humility

I played humility.
Then I created a 1/1 soldier token with [[Elspeth, Knight-Errant]].
I then played [[Gleam of Authority]] on the token, giving it vigilance and "{W}, {T}: Bloster 1."
This all worked fine, I attacked with it, tapped it for its ability.
AI Opponent took control of it with Vedalken Shackles and then released control of it again a turn later. (AI seems to always untap Vedalken Shackles every turn, but that's not relevant here.)
Next turn when summoning sickness wore off I attacked with and noticed it didn't have vigilance any more, nor did it have its tap ability.
It did still have Indestructible from Elspeth's emblem.

I believe, correct me if I'm wrong, that as long as the aura comes in play after Humility does, it will grant the ability after Humility has had a chance to remove it, which seemed to work for a while but then stopped working.