I stumbled over the problem and "solution".
In LR if you got to Preferences, there are several tabs. One of the tabs is Presets. Near the middle of that window is an option to save your Presets in the same location as your catalog. I had turned that on. Who would have guess that option would cause plugins to not show up when you right click an image?
I turned that option off and I can still see my Presets and once again, if I right click the image both my Nik Collection and Perfect Photo Suite modules all show up as plugins.
Obviously the option for the Preset location must create a path that is used for more than just finding Presets.