The tweak offered by Michael in the link in post #9 has resolved the issue of leading to other users photos in Group by Member /Category viewing.
The only place it leads on to other users photos is when viewing Slideshow.
If a suggestion can be offered to only show users pics in Group by Member/Cat in Slideshow that would be great.
For the time being we are going to turn off slideshow as I find that after I have viewed a number of pics using slideshow, which works fine, that my computer then becomes sluggish when I browse elsewhere. ... as if it is still trying to digest all the pics I have viewed.
This has always been like this though I've never mentioned it.