I saw an extrange bug with the field "Title" and the URL.
Steps for replicate the issue:
Please, try add as title: ¿¿¿Ñandú está de cazería???
2) Click on Publish.
3) You can see the wrong URL that appear:
In others servers with this wrong URL, the system can not access, it said "Sorry, no posts matched your criteria."
Thanks a lot.