Please please get the mac app sorted. Get on the developer programme so you can plan in advance for updates by testing with betas.
I'm sure you already have an apple developer account. We use this to test our apps on the beta versions so that when the public release is out even the public beta our apps work. I guess your app relies on some pretty advanced parts of the system which Apple are notorious for changing and updating. Good luck and hope to see the app out soon for mac as myself and a number of colleagues are waiting for it. Also, do you plan to release an API in the future?