Can you upload your save file somewhere so I can take a look? It should be located in the folder ~/Library/Application Support/Lazy Dog Software/LCS (the Library folder may be hidden by default)
Hmm, this kind of thing often happens if there's an unhandled crash - if this happens, can you exit the game and upload the output_log.txt file somewhere? It will be in the same location as the save data but it gets wiped every time the game restarts so it's only good if the error happened in your last play session. Uploading the save would be useful as well if it's something that happens every time you try to go there.