Something still missing.
This thread was not "starred" as one I had posted in. And in fact, nothing I posted during the "outage" shows up in my "Activity", though the posts are in the forum.
Looking at the other users on this thread I see their posts on this thread are missing from their Activity also.
Brit, for example, has things in his Activity where he reacted to posts in this thread, but his posts in this thread are not part of his Activity.
Maybe we will have to live with it, but I have no easy way to find any thread I may have responded to this past day.
***EDIT***
This post itself does show in my Activity, but the previous post in my Activity was from before the problem happened.