My only further suggestion Gary is to buy the photography package in the CC subscription plan. There is only so long you can fight it and you may be reaching that point. There are new features and capabilities being packed into these programs all the time, some of which are actually pretty good, and you have the assurance of always being as up-to-date as Adobe makes possible this way. When the Application Manager indicates your version is up-to-date, what that means is that no further updates are available FOR THAT VERSION, even if the last one happened a year ago. It doesn't necessarily mean you've achieved the best consistency available between the OS and the application.
Hi Mark
You do make a good case for the Cloud, but I think I'll probably just stay with what's working for the time being. Everything works as expected in Mavericks, and since I have multiple clones of my OS & Apps volume, I have no problem with back ups etc. As a matter of fact I installed El Cap on one of my Mavericks clones and then a clone of that volume as a back up. That's a procedure I've followed for many years when upgrading the OS, and it has served me well. I do have two Mac Pros(2010-2012) and the El Cap drive is installed on the secondary machine, mostly for exploration. It is rather unlikely I will install El Cap on the "Work" Mac Pro, for obvious reasons.
Ron - I have also thought of installing Sierra on one of my Mavericks clones to test that OS and the apps I use every day. Unfortunately I'll have to download Sierra again, since I foolishly trashed the installer a few weeks ago, once I had El Cap installed. At that point I had not come across the glitch with the "Open File" dialog in PS CS6 - El Cap. However, downloading Sierra is just a time thing, so no problem. That way I can at least give it a try.
jwlimages-John That's interesting that PS CS6 seems to be working with no issues in Yosemite, so as I might install it on one of my clones and see how it behaves. Of course another possible issue I always have to be aware of is how each OS version will handle the Printer Drivers I use, mostly the large format ones for my work. That has not been an issue at all in El Capitan.
Thank you all for the input. As always, LuLa rocks! I'll keep watch ; ~)
Gary