Signed in this afternoon (local) for first time in months. ( My apologies for absence.) As usual, PC remembered my info after I'd entered initial. Couple of hours later, using same link, screen was a mess, no log-in box etc etc...
I followed the 'we have a problem' thread, came in by suggested route, signed in afresh. So, we'll see what happens next time...
D'uh, yes, this Browser_PC runs XP_SP_2 behind a *paranoid* firewall.