Thank you for the prompt response, but I’m more than a little disappointed with the content eg “There are multiple things you can try”, this strikes me that the attached log file does not provide sufficient information to debug a problem, and that the poor benighted user is left with the “fiddle factor” eg try this and try that. It unfortunately typical of the response that one comes to expect of the computer support industry in general.
Also, I blame myself for committing a number of the cardinal errors when it comes to dealing with software updates, namely :
(a). If it’s not broken don’t fix it.
(b). Never install any updates, they usually cause new issues.
For a new version always do a clean install and keep the old version.
What I propose do now is to delete Xplane and any add-ons in their entirety and start again from scratch using the original 10.3 version of the discs, then I can be confident that this will give me a working system again.