I'm on a mac as well and I am also having trouble saving. This is happening to me as well, unfortunately I don't have a solution, but it's good to know that I'm not the only one experiencing this :/
Hey, if you're still having an issue with this - I posted an answer under MiunaShiroi's comment - hope it helps!
thanks for replying with a solution, I’ll give this a go once I have the time to, and I’ll comment once again if it works. Your help is greatly appreciated :)