Hello... an update for you.
Having followed solution one above and removing the double from the save path everything seems to be ok. So far I have done some test renders (to screen) at different sizes and have managed to save them all using the save icon.
The only thing I have noticed is that on opening Vue each time I have to go into the settings and remember to change the save path. For some reason it doesn't remember that I removed the extra
Still, at least it is working.... so far!
Thanks for all your help.   :o)