I see the meta boxes appear in the screenshot, but not the meta box content. Do you use any CSS or somehow to hide them (like clicking on the meta box title)? I see the content of other meta boxes are hidden as well.
I got it. I recommend you include the plugin by TGM Activation Class as pointed out in the documentation. The way you include the plugin inside theme was the old way and it might lead to problems as I wrote in the documentation.