Okay, here's where I'm at:

1. I created/inserted a Custom ToC
2. Still nothing happened on PC 2
3. Leaving the document open I started messing around with an ActiveX button
4. This led to seeing that a [Ctrl+click] activates the button to take me back to the top of the document
5. While at the top I decided to do a [Ctrl+click] on the ToC
6. Viola, the ToC now works
7. Next I revisited the original/original big document (not TrialToC.docx) that started this whole nightmare
8. Using [Ctrl+click] made the original/original document also work just fine
9. However, to assist any user in using the Return To Top of Document (ToC) button I would have to make an ActiveX button to claim the [Ctrl+click] maneuver while hovering over it

Thus, I am left with the confusion of - Why can I activate the ToC on PC1 just by hovering over it and clicking, BUT, on PC2 the same hovering gesture does not display a finger until [Ctrl] is pressed while hovering, then commence with a left click to activate. Henceforth, is there any way to eliminate this extra step and why is it occurring on [MY] PC2 (but not Charles Kenyon's PC) in the first place?