Snow Leopard, core data, read only and multiple threads

I've got an app that worked on Leopard. I ported it to Snow Leopard SDK 10.6, and now it works on Snow Leopard, but it doesn't work correctly on Leopard anymore. I haven't changed anything that ought to affect this. It's an app with a foreground gui that writes an XML coredata store. A

re: Snow Leopard, core data, read only and multiple threads

I've got an app that worked on Leopard. I ported it to Snow Leopard SDK 10.6, and now it works on Snow Leopard, but it doesn't work correctly on Leopard anymore. I haven't changed anything that ought to affect this. What doesn't work ? It's an app with a foreground gui that writes an XML