@broadstairs:
I decided to try a full re-install of TB on my Win 10 DT PC, picked up the current BB configuration without any issues however, all the anomalies as listed in my first post were still there so, despite TB having run faultlessly for many years on my Win system just can't get around the issues which occured since the major program update earlier this year
It's back to BB for me, TB for whatever reason just won't behave on my particular Win 10 Pro setup?
Downloaded and ran the latest BB program update on top of the existing installation, no problems encountered, won't have any reservations in future about performing BB updates.
@roseway:
Thanks for the information.
Could not download the UK language pack, was being blocked by Firefox as unsigned even after defeating the browser attachment protection, however, not relevant now thanks to the information you have provided.