I had a large database app that I never could get working in the previous beta implementations of Cocoa because it would always freeze on startup without generating any debugging information. I finally got the app working in Cocoa with Xojo due to the much improved Cocoa debugging. It took less than an hour to resolve the problems and get the app working once I had useful debugging information.
The only issue I have now is that the app is blazing fast in Cocoa but still painfully slow in Windows, but I suspect that problem has more to do with differences in the OS.
glad to hear you got your application working.