Thanks for quick response Basj,
Windows 10 ver 1909, build 18363.720
Doesn't work with any apps that I just tried -- Evernote Desktop, Priority Matrix Pro, Copernic Desktop Search, Windows File Explore, Chrome. Don't think it works with MS Outlook, Neo Pro, Firefox either, best I remember. Doesn't work with anything as far as I know.
Been having this problem before latest 1.32 Groupy update too, and probably with earlier builds of 1909.
I've tried switching to the delay grouping setting several times before, as it would be great to avoid the accidental groupings.
The Control option does work, but I prefer not having to reach for the keyboard to do a grouping.