Unfortunately, updating FH is not an option. Since the maker of the game has retired from working on it to go do more projects and did not leave the code that allows us to work on the game, it cannot be updated.
Sadly, I do not know much about Macs nor do I know the properties of what their updates contain. Do ye 'ave Wine, though? I know Wine is a good way to get FH to work on Macs, but I do not know if 'tis the only way to get it to work or if there are other options as to get it to play. If ye be using Wine already and it be Quartz that is just not letting ye work with it, can ye change back to the previous update?
I believe someone had the same issue and managed to 'ave this fixed by calling Apple itself. Unfortunately, I cannot seem to find the thread where this issue occurred. Calling the experts is always a good way to go, so if ye can't seem to get it fixed by our fantabulous staff of FH /and some Mac/ wizards, I suggest ye give Apple a call and see if they can tell ye what ye need to get things back in working order.