This thread is getting quite long, so I’ll post an update…
My initial pass through of matching up existing activities to all the new data missed piles of activities.
I’m going through that process again, in the order of Subscribers → Supporters → Everyone else. There’s a lot to go through, so that last group is going to take 
probably a couple days. I’m hopeful that the first two groups are finished today.
Since it seems to be affecting so many people, I’m just going through everyone rather than spot check. Please hold off on any more “also my account” posts for now. I’m going to post another update in this thread when (I think) I’m done - if there is any missing progress at that point, I’ll invite people to shout. 