Thanks, Graham

The %appdata% paste took me to Users\MyName\AppData\Roaming\Microsoft\Templates, where I was before. No sign there of NormalPre.dotm.

(I can see a NormalEmail15Pre.dotm. But that dates back some years).

Went to the Root Directory of the Operating System drive and put NormalPre.dotm into the search box on File Explorer. No items match.

It's a bit of a puzzle, too, how the switch to Windows 10 could have caused this. For two weeks now, I've been using the Windows-10 system extensively (including MS Word) with no problems.

[Incidentally, this wasn't a clean-install of Windows 10. It was one of those 'keep-all-your-files-unaltered' installations.]

Anyhow, I went to the last big backup I made, less than a month ago. Plugged in the external drive, went to the Appdata\Roaming... address and found the normal.dotm file I'd saved. Making sure nothing was already open in Word, I clicked on that normal.dotm.

But there are no macros. That seems weird. At the time that backup was made, everything was working fine, so presumably the dotm file must have been saved with all macros present and correct.

It almost seems as if the problem might not be in the dotm file but might instead be in the Word application that is opening it. Would that be possible?

Anyhow, I'm back to wondering. Do I take the normal.dotm from the laptop and replace the existing macro-less normal.dotm with it? Or, do I open the new, macro-less normal.dotm, get into an appropriate VBA window and copy the macro code in from the various text files I've made from the laptop?

Am inclined to do the second... But don't know enough to judge. Wondering all sorts of things, e.g.
(0) How can all the macros suddenly disappear. Ought I to start keeping regular text-file backups of the macro code...?
(1) Can I check what may have happened with the Building Blocks?
(2) I was thinking also to look at the custom dictionary file, but can't find it.
(3) Most of the templates seem to be duplicated, being found both in Users\MyName\Documents\Custom Office Templates and in Users\MyName\Appdata\Roaming\Microsoft\Templates -- does the first of those addresses just function as a pointer?
...
(n)...

Okay, most grateful for any advice you may have. Many thanks.

Geoff (is my name)