achievement doesn't work

Problems starting and running the game on Mac (M3). After the most recent update (around the 25th November) has become unplayable. Before update: = Game sometimes starts but sits on a white screen for a while before eventually loading - was able to play game. after update: = Game sometimes doesn't start at all, the icon just bounces in the dock until I force quit = Game sometimes appears to start - the icon in the dock is steady with a dot underneath to show its running - but no game window op...