First at all sorry for my bad english,
My app works fine in Simulator 3.1 and 3.2, but when run in 3.0 always throw this exception:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0x4e, ....
I found this related question: http://stackoverflow.com/questions/2155427, but the solution proposed not work for me.
Viewing the trace i see the error happend when load the MainWindow.xib, i create a new nib file, but the exception still throwing.