My drop-down menus returned.
I did absolutely nothing, mainly because I don't know how to do anything.
Yesterday, before I shut everything down for the night, I shut everything down and then rebooted, just to see if a complete restart would do anything. It didn't. I still had no bookmarked sites, no drop-down menus. So I logged off, turned the computer off, and went to bed.
I was also angry because I had had to deal with yet another Stupid Person, so I wasn't in the mood to mess around with computer crap any more. I read on my Kindle until about 11:30, then went to sleep.
This morning, I headed directly for the studio. I did a little more sewing -- there's all that free fabric, you know -- and started another Angel Feather pendant. It's one of those really weird shaped ones, so it wasn't fun, but I was forcing myself to be disciplined.
When I finally came back in the house and turned on the computer. . . . my drop-downs were back.
I give up. I will never understand it and I'm no longer going to try. At least I don't have to deal with the McAfee tech people.