Nothing happens!
I have been hitting my head against this all day.
But it seems that what’s happening is that when I update the game files, then it stops working. I’m guessing it’s some unfinished security setting in Steam, because if I delete the steam entry (and exit, reboot, go back to desktop, make a new game entry, reboot) - then it works.
What a pain! Not your fault, either.
What makes this more a pain is that [mv -u] and dolphin + overwrite older files wasn’t working because instead of overwriting files it was overwriting folders. So I had alot of false starts. Good ol’ [cp -R] worked fine.