I'm not sure it's completely related, but with the latest update to Pigments, I have a similar situation where the ASC and the website both state that Pigments is licensed and authorized for my machine, but when I open Pigments it states the product is "not activated on this computer", and will only run in Demo mode.
Have tried multiple methods, including complete uninstall/reinstall, and so on, but nothing is resolving this issue, and it is highly annoying.