A colleague brought over his Breezer Uptown bike today as he's not received any satisfaction from the bike shops he's tried. The problem was that he felt like the rear end of his bike had gotten unstable. I think the first bike shop said they couldn't find the problem; the second sold him a fairly expensive new rear wheel with a Velo-Orange hub. Problem still persisted. Here's what the right chain stay looks like at the dropout:
I'll be switching parts over to either a Raleigh Gran Sport or a Peugeot UO-8 (both of which offer some complications, but they're the right size).