I´m not able to open any category from my posts, i used to have a blog (category) page where all the blog posts could be seen together, and now I can´t open the categories, and it shows: bad request message. On the image you can see de GALERIAS, which is a category also, and when I click the menu, the bad request happens again…
In that case, would you mind providing us your site’s WP Credentials i.e. Username and Password, along with the URL. It’d be helpful for our team to investigate further.