Never mind, as soon as I wrote the problem down, I saw the answer. Happens with writing some times.
Apologies.
And….
…it just happened again. Composed a long response, hit submit on this page: https://wordpress.org/support/topic/separating-subscriptions-and-comment-notification?replies=1#post-8460609
and the work was wiped out.
I’m on Firefox 46.0.1, and Windows 10. Thanks for the response, don’t have time to recompose the whole message right now.