Major frustration. I've been over the tutorial for Nik plugins many times (installing nik will need a separate thread) and it looks like I've connected SnapHeal Pro, Intensify CK, and Luminar 2018 correctly.
However, when I call them up, I get the "Plugin started" popup but nothing happens. Eventually I need to force quit AP move on with my work. I think the documentation about regarding specific plugins really needs to be created and easily found.
Mac El Capitan