Ordinal Numbers and Permalink

Hi I update my version today, and since I’ve been using WP I never saw this problem. In another site running with WP that I have with and older version, I don’t have this problem.

The first one is when I try to type o(ordinal numbers) in the content box in admin screen I got a “lightbox” box with the Accessibility Help text.

And the other is when I type o or a ordinal numbers in the title and (I’m using permalinks) I publish the post, when I’m click to view the post, always have a broken link. If I remove the o or a, the link works fine.

What I already try?

– Create a new .htaccess – Result: not work, broke my entire WP
– “Restart” the custom permalink, going to default and later to custom structure (/index.php/%year%/%monthnum%/%day%/%postname%/)
– For the content box, I even found solution or attempts.

Thanks for anyone to help me in a future,