I reached one of the islands for the 'find the survivors' mission', the game just closed the first time with no message, just straight to desktop.
I re-opened and loaded in, I jumped off of my ship onto the beach, ran a few steps and then it closed again.
The third time I was able to kill a number of enemies with my ship cannons when this message popped up "Pure virtual function being called while application was running (GIsRunning = = 1)."
I then clicked on 'ok' and it closed the game.
I have not yet tried a 4th time.