FWIW my system was full of older V10, V11, v12 & v13 waveshells.
I decided to do a full delete of all Waves. Then did a Cleanup. Both of these tasks were done in Waves Central.
Then I did a full install of all V14 plugs (which is everything they offered up until yesterday).
Then I opened Studio One and I was amazed at how quick the Waves Shell was in the scan. I was afraid something was wrong, but nope, everything is showing and I did some test loads of plugs and had no problems.
That's my story and I'm sticking to it.
I'm off to rescan in all my DAWs.