Post by category

I’m trying to set a blog page to work with just posts from one category. I wanted to do more than one page: each with a different one. But for some reason none of the plugins I’ve used before to do this are working now.
I’ve tried shortcodes ultimate and one called Content Views.
None are working. I even tried switching themes.

Is it just something I’m missing or is something changed in 4.01 so it doesn’t work anymore?