I was not psing a table of my own. I am entirely using the MyAssist presets, and have the option set to create a table, rather than asking it to read one of my own. I jpst felt it best to avoid all other possible errors I might inadvertently introduce.
I shall give this a little break to recuperate, and then try again, deleting as much as I can, and then try again.
Thank yoo,
KAB