Yesterday I received an e-mail from Joanne at Merge Games...quoted below:
Thanks for your mail and I am very sorry for the trouble you are having. I am going to get onto Daedalic, as they provided the hybrid master for the game... i will get back to you asap...in the meantime please accept our sincere apologies. We currently run 100% on PCs and outsource any Mac testing. In this instance, we took the master straight from Daedalic, who have always provided us with very technically sound products, but clearly there is an issue here. I will get back to you as soon as possible.