In 2/2 games today, I've bought the last province with my last buy, and the score screen never showed up. Both times, I drew a new hand, and the game skipped to my buy phase and stopped.
I am having the same problem - was going just fine in Chrome, but haven't gotten a game-end screen on Firefox. Last province bought - it draws a new hand and freezes. Left-click on cards still works, etc., just the endgame/score screen is not displayed. I have to reload, then kick before logging back in.
markus told me he had the same problem with Firefox on Windows 10. With Chrome, it didn't seem to happen.
(I use Firefox on Windows 10 as well and have never had this issue.)