So there I was, just shakin' that gallon jug like mad, waiting for that big foamy froth to rise up... and nothing. Shook it even harder... nothing. Then I thought, "Oh... Fermcap in the starter. Whoops." So I fired up the stir plate this time, and I'll give SNS a shot next time.
Don't put Fermcap in your SNS starters! Should have been obvious, but hindsight is 20/20.