It's happening again. After I posted the above comment, I received a whole "bundle" of email notices over a few minutes' time re recent comments on threads that I'd participated in. Since then, I sometimes get a bundle of notices over a few minutes re comments going back hours. I have seen subsequent comments on threads where I posted last night, but no notices. Nothing in my spam folder. I also have received emails from other sources in recent hours, so I doubt that it's at my end, or mine alone. So, again, a possible data point. Thank you.