Ahhh yes… The power of pictures. That was why I requested them - it is so easy to go back and forth with text messages where both parties are misinterpreting the other, while the pictures made it instantly clear what the issue was. Brian is correct, it never even occurred to me that you were using tree browsing. And since I don't personally use tree browsing, without the pictures we would have gone back and forth several times trying to diagnose the issue. As it is, Brian beat me to the punch for the solution (with the assistance of the pictures).
And finally, regarding this
Thanks! Unfortunately, when I go to Tools/Options/General/Behavior/, there is no File Properties to double click on (see attached).
In your third picture, do you see where it says
Double-Click: Replace Playing Now (all) (the second line under the behavior subsection you highlighted)? If you click the down arrow at the left, or actually anywhere on that line, another menu will open up. At the bottom of
that menu is the option to choose
File Properties. Regardless, it looks as though things are back to how you wanted.