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.
Cheers, Peter G4URT