I think this is platform wide (all SE sites).
- Choose a tag, eg. java on SO
- Try to sort questions by something other than newest
No matter what sorting is chosen, questions are sorted by newest
This was done deliberately to deal with a anonymous DOS. Quoting Shog9 on Meta Stack Overflow:
Requests from anonymous users to some of these routes were causing an unacceptably large performance hit a few days ago, potentially hurting the experience for many other users.
As a result, they were disabled for anonymous users. They may be re-enabled at some point when we have had time to implement a less drastic solution.
So until that solution is in place, this is status-bydesign I'm afraid.
Note that for anonymous users, the other sort options are no longer displayed; all you get are the newest and info tabs; frequent, votes, active and unanswered are all gone from the UI:
Another effect is that multi tag searches are also disabled. Any tag search that combines two or more tags redirects to the first tag picked. The search for
python-3.x redirects to the page for just the
python tag because it is listed first; swap the tags and again you are redirected to just the first tag.
I don't know if this is intentional, but they removed only the GUI, the functionality is still there if you paste the correct parameters into the URL. So you can still sort them, just add the parameters like you see it in a site where you are registered. Some examples for question sorting:
Sort by newest:
Sort by featured:
Sort by frequent:
Sort by votes:
Sort by active:
Sort by unanswered:
With this info, somebody could easily create a userscript that adds back the buttons with these links.
document.getElementById('tabs').insertAdjacentHTML('afterbegin', '\ <a href="/questions?sort=featured">featured</a>\ <a href="/questions?sort=frequent">frequent</a>\ <a href="/questions?sort=votes">votes</a>\ <a href="/questions?sort=active">active</a>\ <a href="/questions?sort=unanswered">unanswered</a>\ ');