So I have been asked a few times now from different people wondering why the CataBlog Shortcode won't filter categories. Strangely enough the solution is very simple and kind of comical.
Many people who use my plugin come to the blog to learn more about using it. When they see an example of how to filter by category, they might copy and paste that example into a page or post's visual editor. This works fine in most scenarios, but in this specific case, the pasted Shortcode is entangled within a bunch of
<code /> tags. These HTML tags mess up how WordPress configures the Shortcode and stops your category setting from being used. Simply remove the extra html tags or type in the CataBlog Shortcode manually to avoid this problem.
There you go, if for some reason your catalog isn't rendering correctly, please check your page or post's content in the HTML view and make sure the Shortcode doesn't have any random html code inside its brackets. Here is an image to illustrate exactly what I am says...
An example showing both the correct and incorrectly pasted Shortcodes.