I got this working by using a plugin (custom post types UI) to add the custom post type “proof_gallery”. For some reason the plugin did not create it.
It works now…kind of … my theme still sets up the proof gallery like a blog post. Working on that now.
Same issue here, I’ve sent a ticket in … since I don’t own a pixelgrade theme.. not sure if I will get any support. Hopefully someone finds and answer to this and lets it be known.