...the "helpful post" page after you've navigated away from it?
If someone "appreciates" your post, you get a notification for it. However, once you've checked it once, meaning there's no more notification, I'm not sure how to get back there. This presents an issue when you get more than one thumbs up at a time, and you want to check multiple ones.
This was asked in the main new site thread here, but I'm guessing it was overlooked with all the posts.
You can use your back button to go back to that page after you check one of the posts (provided you're not one of the people having trouble with the back button -- that's a separate issue that's cropped up recently that I think is unrelated to the upgrade).
I'm going to hunt around to see if I can find a direct access point for it too. I believe that all your likes are maintained as a record on that page, so if you get a new one, you'll be able to check your old ones then too.