Actually, I wish I’d known that when you change a widget, sometimes it takes 15-30 minutes for the change to show up. I’ve had a hell of a time trying to “fix” widgets that were probably fixed but I didn’t know it.
As for a related posts widget that works, I’ve found several that work fine if all you need are titles displayed. As soon as you want a thumbnail, then there’s the issue of having to enable the feature thumbnail in the WordPress editor. And if you do that, then you get a thumbnail as you first post image instead of the 300×300 that you (namely, I) want.
I’m happy with the current related posts plugin which is contextual. I don’t have to use tags (which I don’t like so much), and it does a great job of finding closely related posts from the context.
Some day I’d like a related posts widget with independent thumbnails that I can put in the sidebar…
https://www.diypics.com
Thanks!