Just verified--that did it! Thanks again, woozle. Say Hi to heffalump for me, too, eh?

woozle wrote @Greybeard3 Hi, What operating system are you using? Whenever I connect to a new router (i.e. network) with my Windows 11 machine, then by default Windows will set the new Wi-Fi...

@Joseph-TP Thanks, but no, no, and no! I should have noted in my post that I'd seen those two isolation options and said "Well, those aren't set, but they sound like they would/could be a problem if...

OK, I'm missing something obvious here, I'm sure. Had a Netgear router that was going bad, replaced it with this TP-Link. Things are a bit different, mostly better, with one exception so far: I...