I have a Cocoa app that has an `NSWindowController` controlling an `NSWindow` with an `NSComboBox` in it. Nothing special, and it worked fine until upgrading to OS X 10.7.2. Now I get the following exception, which occurs only once, when the window controller&#39;s window loads. (Since the window controller in my app remains loaded, it happens only once per app launch.) Subsequently focusing and unfocusing the combo box does not trigger it.

Anyone know whether something changed in 10.7.2, and if so how to work around it?

(This is happening with Xcode 4.2.)

    2011-10-24 11:30:21.649 MyApp[7934:707] Unlocking Focus on wrong view ((null)), expected &lt;NSComboBox: 0x40083d6e0&gt;
    2011-10-24 11:30:21.653 MyApp[7934:707] (
        0   CoreFoundation    0x00007fff8412d286 __exceptionPreprocess + 198
        1   libobjc.A.dylib   0x00007fff88cdad5e objc_exception_throw + 43
        2   CoreFoundation    0x00007fff8412d0ba +[NSException raise:format:arguments:] + 106
        3   CoreFoundation    0x00007fff8412d044 +[NSException raise:format:] + 116
        4   AppKit            0x00007fff8c76c1d5 -[NSFocusStack unfocusView:] + 194
        5   AppKit            0x00007fff8c7e838e +[_NSAutomaticFocusRing showForView:] + 2545
        6   AppKit            0x00007fff8cdbb4d1 __postActiveFirstResponderChanged_block_invoke_1 + 32
        7   CoreFoundation    0x00007fff840ecf37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
        8   CoreFoundation    0x00007fff840ece96 __CFRunLoopDoObservers + 374
        9   CoreFoundation    0x00007fff840c2159 __CFRunLoopRun + 825
        10  CoreFoundation    0x00007fff840c1ae6 CFRunLoopRunSpecific + 230
        11  HIToolbox         0x00007fff8c0d73d3 RunCurrentEventLoopInMode + 277
        12  HIToolbox         0x00007fff8c0de58f ReceiveNextEventCommon + 181
        13  HIToolbox         0x00007fff8c0de4ca BlockUntilNextEventMatchingListInMode + 62
        14  AppKit            0x00007fff8c71e3f1 _DPSNextEvent + 659
        15  AppKit            0x00007fff8c71dcf5 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 135
        16  AppKit            0x00007fff8c71a62d -[NSApplication run] + 470
        17  AppKit            0x00007fff8c99980c NSApplicationMain + 867
        18  MyApp             0x0000000100001682 main + 34
        19  MyApp             0x0000000100001654 start + 52
    )


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Unlocking Focus on wrong view ((null)) under OS X 10.7.2