There's currently a bug with "hot" and "active" where old posts remain at the top. I don't remember the details but it's getting fixed in v.0.18 (which is already in release candidate 4).
There are two solutions until the fix is released:
- get your server admin to reboot the server everyone in a while. This seems to temporarily refresh the content.
- use "new" or "top day". That's what I've been doing.
The removal of the custom thumbnail is refreshing. No more wired reactions with an arrow pointing at something.
I'm going to give this a try. The sponsorblock people have great ideas!