I can launch studio or other plugins one trim from PS since the last update of both ps to 2018 and topaz studio update 10232017. After that I cannot go back into studio. It just does nothing. That is from a regular or smart layer. If I exit Photoshop completely and go back in I can again use studio once without having to exit PS 2018. Rather annoying.
I am not seeing this behavior in the Lightroom classic.