I appreciate your input. As I said in my initial post, I'm still not sure it's a big enough problem to spend time tracking it down. It only happens occasionally. I'll take a look at the Cookie settings. I just now tested it again, with the same laptop and instance of Safari that I wrote about last night, and it worked fine. So, whatever it is is apparently transitory.
What specifically are you referring to WRT SSL settings?
UPDATE: Cookie path is set to the default, and I don't use a cookie prefix. (It's blank.)
Last edited by Baldeagle; 03/20/2018 5:51 PM.