After further investigation into the cause of my computer slowing down after viewing slideshow it was determined to be caused by the distance of my computer from my wireless router.
Sorry about that but I'm happy to say the slideshow works fine with a closer/better connection.
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There are 2 remaining functions in Group by Member/category that a users pics lead on to others in the category:
Slideshow: The url shows as ...
/slideshow.php?photo=594&cat=506&slideshow=1&slidedelay=2&size=medium
ie, it needs ... &ppuser=1234 in the url to only find users pics per cat
More link: Using this link goes to all pics by all users in the category.
It would be great if this only went to pics by member/cat.
Finally is not just for personal needs that I request tweaks but hope that at least some will lead to improvements in this product for the community as a whole.
Thanks!
Mark