Hi! Yeah there are a few problems with the mac version at the moment. I have limited access to a mac but I should be able to get it fixed this week. Keep an eye out for the 0.92 mac version (should be up some time tuesday).
Incidentally, the 0.92 version changes how the lantern works so you don't have to worry so much about filling it.
Saves from 0.91 should work with 0.92, but it's possible that the problems will carry over with your save. Sorry about that!