Win10 1803 (up to date,)
Word 365 MSO (16.0.10730.20102) 32-bit, (on 1 month trial)
ePubTools 1.27
Tag Formatting: It seems to be working!!!
Mark Tool: I just edited the ePubTools.cfg file and removed the '###' from Mark Tag. And it worked, i.e. I get colour marking without any tag!!
I can assure you that did not work the other day. Yet prior to that it had been working for years, I removed the "ToxarisMark" (??) from ePubTools.cfg with an editor years ago.
Add-In disabled: In Tex2002ans' most recent post (last para) he mentions that ePubTools sometimes goes AWOL, that's also happened to me. My experience with Word 2007/2010/2016 was that it was permanent, and could only be reinstated by a fresh install, including the configuration folder. But, when it went AWOL the other day with Word 365, it was reinstated when I stopped/started Word.
I have 2 other COM Add-ins, that I've also used for years, neither has ever exhibited this problem.
Weirdness prevails.
Added: Does this mean they fixed
Find/Replace with formatting in Word - in FIVE (5) *&^%$@ DAYS!! For everyone or just thee and me!!!! I added three votes to your Bug report
BR