Resolved!
The good news is, Adobe fixed it. I went to their website, got a live chat, and the tech offered to fix it.
The bad news is, it took her forever! She requested control of my screen which I gladly gave, but watching her do the fix was painful. Either her connection was slow, or she’s not very adept at mac. She said she’s resetting the preferences (which I had already done). I didn’t pay close enough attention to repeat all her steps here, but it seems to me she stopped all Adobe activity in the activity monitor window. Then she played with permissions of various folders.
I just wish she had given me instructions and let me do it myself.
The crazy thing is, this symptom just showed up on a different mac here, and I’m beginning to suspect it’s the keyboard brand I’m using. We have the Macally keyboards.
I guess I’ll keep you updated.