This, I think, is the problem. I had tried what everyone else suggested; the problem was that I was never getting the cursor for entering text. I never intentionally rasterized the text I had typed, and never was warned that that was going to happen. I presume it is something the Assistant does under certain circumstances (without warning!) or possibly I used the key combination Ctrl+Enter (since that was suggested somewhere in the Help info, along with various combinations with the Esc key.
I had to completely retype the material I had set in AP -- in Ms Word. What I have learned from this is simply NOT TO USE AP for Frame Text!!! It's too unpredictable, and I have other options.
However I do like the photo functions, and have virtually ceased using Photoshop.