Core-plot Xcode 4 not work on Device

I developing my app with core-plot, and it worked fine before Xcode4. Now it only works on iPhone Simulator. And i get a BAD_ACCESS when I load m开发者_Python百科y viewController (wich load my plots). The BAD_ACCESS is on the following line:

[self presentModalViewController:controller animated:YES];

I give you informations about my build settings:

Architecture: Standard(armv6 armv7)

Build active Architecture only:YES

C/C++ compiler version: LLVM GCC 4.2

other linker flags: -all_load -ObjC

My header search path is OK (I think, it works on Simulator)

Tell me if you need more informations, or my entire code ^^

thanks for help anyway

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You should then retain your controller.