I figured out that the following is Xcode's humorous way of saying "only change 
the UI from the main thread". Okay, got it. But what's with all the <redacted> 
stuff in the call traceback? It make it essentially useless.
-Carl


This application is modifying the autolayout engine from a background thread, 
which can lead to engine corruption and weird crashes.  This will cause an 
exception in a future release.
 Stack:(
        0   CoreFoundation                      0x255a7933 <redacted> + 150
        1   libobjc.A.dylib                     0x24d42e17 objc_exception_throw 
+ 38
        2   CoreFoundation                      0x255a7861 <redacted> + 0
        3   Foundation                          0x25e993e7 <redacted> + 170
        4   Foundation                          0x25d3dd1f <redacted> + 38
        5   UIKit                               0x29c2737d <redacted> + 52
        6   UIKit                               0x29c27d63 <redacted> + 222
        7   UIKit                               0x2a36423f <redacted> + 322
        8   UIKit                               0x29e260e1 <redacted> + 148
        9   UIKit                               0x29b1ca73 <redacted> + 714
        10  QuartzCore                          0x27bb5bdd <redacted> + 128
        11  QuartzCore                          0x27bb1385 <redacted> + 348
        12  QuartzCore                          0x27bb1219 <redacted> + 16
        13  QuartzCore                          0x27bb06e1 <redacted> + 368
        14  QuartzCore                          0x27bb03b5 <redacted> + 520
        15  QuartzCore                          0x27bddedb <redacted> + 310
        16  libsystem_pthread.dylib             0x252da54d <redacted> + 508
        17  libsystem_pthread.dylib             0x252da14f <redacted> + 86
        18  libsystem_pthread.dylib             0x252db065 pthread_exit + 28
        19  Foundation                          0x25d157ab <redacted> + 10
        20  Foundation                          0x25dd14c7 <redacted> + 1182
        21  libsystem_pthread.dylib             0x252db85b <redacted> + 138
        22  libsystem_pthread.dylib             0x252db7cf _pthread_start + 110
        23  libsystem_pthread.dylib             0x252d9724 thread_start + 8
)
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