Same here. Game #4444266 on frankfurt.
I bought out all remaining provinces, and the game should have ended. But instead it got stuck on "Waiting for JW" after reshuffling as if the game was continuing. The recent log:
J shuffles their deck.
J draws an Estate, a Duchy, an Expand and 2 King's Courts.
Reshuffling the Black Market deck.
Fortunately, I was able to resign the game (that the server should have recognized I had already won) and move on.