Game crashing

Hey! So, I see no one has posted here in a while… Anyway, I just got this game on Steam for my Mac. Great game. However, in Challenge mode, sometimes when I am about to start a fight (after deployment when it says “press any key to begin battle”) it will crash to the desktop on me. If I open the game and try again, same thing happens. If I change the fleet slightly, sometimes that fixes it. But sometimes when I use even a very small fleet it will crash on me. Just wondering if there were any fixes for this problem out there. I have all of the extra graphics and audio stuff turned off. Any help would be appreciated!