I am using an internal University server, but can make adjustments as needed…
I gave the cache folder 777 permissions, and after creating the wp-content/pdf folder, gave it 777 permissions.

While trying to make the PDf, it wouldn’t do anything at all, until I created a blank file with newspaper.pdf and put inside the PDF folder, then all it does is create the Title & Date, the rest being blank.

Are there some other permissions I need to be aware of, as I see many people are having issues with Blank PDF’s