Yes - I knew about the release of WSJT-X V2.5.0-rc5 but as I'm not very good with computers thought that I'd leave it to much better beta testers first.
I will continue to run the old Map65 on the old HP notebook / FCR Pro+ combination for the time being then re-visit in a few weeks time.
I've sorted out the screen issue by hooking the notebook upto an old 21" monitor!
It was just that the symptons were (and still are) very puzzling.