First of all, this theme is great and it absolutely blew me away when I saw it was free. You guys are definitely doing great work.
I have three posts, all of them have a featured picture and a category that is used for the slider. Somehow it still won’t show. I have tried it with the Child theme and the regular theme.
Here is the link to my website: http://www.rickrozenberg.com/
With kind regards and merry Christmas,