I had a strange thing happen tonight with two loaves of Rose Levy Berenbaum's potato sandwich bread. I thought the dough was a bit sluggish in rising, through both the first and second rises. But it shaped OK and looked like about the right volume in the loaf pans. Didn't get a real great rise out of the loaves, either, though they did just peep above the sides of the pan...barely. But when I put them in the oven, they not only got NO oven spring at all, but they actually FELL a little bit! My oven wasn't as hot as it should have been -- I had turned it down to cook something else, and hadn't turned it back up long before I put the loaves in, so it may not have been the 475 she calls for.
Oddly, the loaves TASTE fine. And the crumb is decent. They're not heavy or leaden the way I'd expected, at least the one I've cut is not. They're just squatty looking things.
Any idea what happened? Did the too-low oven temp to start do me in?