Thanks, David. I don’t know how to rebuild prefs but will check that out.
The problem was last night. I opened the InDesign file again – dragging to my hard drive and not working off the iCloud file.
Everything seemed okay today. The Undo option was there … I could save.

I noticed the program flaky when I copied everything from one layer to another.
Objects lost their color – mostly the type I outlined. Maybe Adobe is fixing all this.

I cannot find the Acrobat DC program in my subscription either.

I’m happy you have this forum. I wasn’t using it. This is helpful. BTW, can you resend the instructions how to make a maze out of an object? I never created the maze from my listing and want to send it to my client’s girls. Thanks for all you and Anne Marie do.