I made a topic in the Basecamp Category back in January. I was both the originator of the topic and the first reply.
Today, events caused me to want to either delete, or severely alter that first reply. The problem? There is no option to edit!
Having no other clear path, I replied to my reply and — hopefully — people will see the reply.
And that, most recent, reply still has the “…” which, when pressed, reveals both the edit and the delete option.
Clicking on my avatar anywhere on that entire topic brings up the same user - the one and only one I’ve ever had - and the one under which I’m currently logged in, so I doubt the problem is related to multiple forum logins.