Thanks for that added pointer, Noel.

Yesterday was totally lost in a welter of Fathers Day things so I didn't get a chance to do anything.

I ran through these suggestions again this morning but with no change at all.

Regardless of any fix however, all of this has at least established that there isn't a user-option enabling you to switch between fixed and proportionally-resizable displays - at first I had simply assumed that there must be, and that I could therefore switch it back once I had found the setting for that.

So if anybody comes here later with the same problem and expectation and wants to find the flipover option for themselves in order to make that change manually, stop looking there isn't one ....

So on that basis I decided to simply reinstall the 2008-2013 upgrade, assuming that something had become corrupt/broken within the installation/files.

And happily that fixed it, the window resizes and so does the content so nothing is clipped.

There may well be some other fix, but one hasn't come to the surface just yet so unless anything suitable is added from a PG tech source afterward this may remain the best option for someone else finding themselves in the same position.

My thanks to those who offered their time and assistance, it was really appreciated ... this is a great community, I wish some other help-forums were even a quarter as good!