Yes, it seems there is an issue with the latest version. I updated Bluebeam 2018.2 a couple weeks ago, and hadn't used the 3d pdf function until I saw this post. If any fab parts are in the drawing it immediately crashes cad. In Navis it just ignores the fab parts and plots the solids. It was functional in the previous version 2018.1 as I was doing 3d pdf's for a job quite often. It was before the the plug-in for 2019 cad was available tho, as I was utilizing Navis 2018v for these exports.