Thanks folks.
I think I see the root of the problem. Having started the doc in one version of Word (2007) and continued in 2013, (though now 2010 as of this morning) I see there are two variations of my name, one with a space in front of it. How this came about and why I seem to be sometimes one and sometimes the other, all in the same version, is beyond me.

The burning question would now be, how can I reassign the changes of one persona over to the other, so I can do all my changes without switching users again and again, or perpetuating the problem.

Based on numerous searches, I think it can't be done.