i'm new to the boards but not new to applying...this is my second time around. i got two interviews and haven't heard back from either--i applied late and my interviews were late. i have a big red flag on my app, but it was from like four years ago. i withdrew from undergrad two semesters in a row b/c i basically had a meltdown... my first year applying, i put that in my essay. the second year (this past cycle) i have SO much other stuff to put in there--good, positive stuff--i didn't address it. and i didn't talk about it during my interviews. no one asked and i didn't bring it up b/c i'm still not sure how it would go over. when i go up for review by the adcoms, is this going to ruin my chances? should i send an update letter now explaining the situation?? my gpa didn't suffer too much, maybe a fraction of a point, but my UG transcript probably makes me look like a flake, with a few W's and a couple I's, and worst of all no explanation any advice on damage control?? to everyone!