Again, if it is an ActiveX button, you will need to save in a macro-enabled file and the user will need to allow macros to run. If the document you are trying on the second computer is a .docx file and it is an ActiveX control, it will not function. Here are temporary links to two documents that have a command button and also a hyperlinked shape to move around a document (to a bookmark). One is .docx and the other .docm. The ActiveX control is present in the .docx document but does not work there. The hyperlink shape at the end works in both.
Dropbox - deleteme Button2.docx
Dropbox - deleteme Button2.docm

This gray is because you have the option set on that computer to shade fields when selected. I believe this is the default setting; it is the one I use.
The delay may well be due to the field being inside the Content Control, as mentioned.

What I'm going to do now is go back through the thread and reacquaint myself with your posts. The bold underline above is what is not registering with me. It may be something that is over my head for the immediate time being, but, I'm going to try and work through it.

Also, Safe Mode on Win10 PC-2 did not solve anything. Interestingly enough when I also opened the TrialToC.docx in Safe Mode on the original PC I found that nothing worked either. No finger pointer, no clicking available to go to parts of the doc.

All of this seems to have a tendency to be heading into unfamiliar territory for me but am trusting the forum sticks with me till we get it solved.

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?