Hmmm, you know, Flash itself has a zoom too, I think, which I didn't think of using, but this was a minor weak point in the relative visual polish... the grid markings were barely legible (and, at least to me, mildly counterintuitive, which made reading them more necessary).
thanks for the help. i was stuck on it for a while, especially with the barley readable type on the last puzzle. i wouldn't have gotten through the first parts without this thread.