OK
@Dave, I think I figured it out. Just now, I refreshed ATP home page, and clicked on the Bar Codes? thread in my watched thread list. Clicked back to the home page (not using the back button), and "site talk" in my watched forums said "new." So I opened site talk, and there was nothing new. BUT... is that because I came into it via a watched thread and not via the forum link? As in, I clicked on "bar codes?" in my watched list, so it bypassed the main page of the forum that lists out all the threads?
(or am I really just hallucinating? heads back out to atp home to double-check)