Thanks to all.
recommendation, while appreciated, is above my pay grade and a bit daunting for me.
Call to Apple last Friday resulted in speaking to an ESL from St. Elsewhere who could not help (I'm afraid that is baseline nowadays) so scheduled me with an Apple Store 3 hours away. I'm trying to avoid the trek. I ran diagnostics on both machines which came up clean. I wonder if the newest Safari I downloaded cold be involved?