Nobody? Here's the backtrace, if it helps:

    0   AppKit                              0x00007fff29b3657e -[NSWindow(NSDisplayCycle) _postWindowNeedsDisplayUnlessPostingDisabled] + 1964
    1   AppKit                              0x00007fff29bc65b1 -[NSWindow _enablePosting] + 302
    2   AppKit                              0x00007fff29bbf1f1 -[NSView _oldDisplayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2598
    3   AppKit                              0x00007fff29bbe569 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 253
    4   AppKit                              0x00007fff29bbb152 -[NSView displayIfNeeded] + 1300
    5   AppKit                              0x00007fff29bb7ee8 -[NSWindow displayIfNeeded] + 283
    6   AppKit                              0x00007fff29bb7d27 __NSWindowGetDisplayCycleObserverForDisplay_block_invoke + 722
    7   AppKit                              0x00007fff29bb2e2a NSDisplayCycleObserverInvoke + 170
    8   AppKit                              0x00007fff29bb299f NSDisplayCycleFlush + 1073
    9   QuartzCore                          0x00007fff3751153b _ZN2CA11Transaction19run_commit_handlersE18CATransactionPhase + 49
    10  QuartzCore                          0x00007fff37510f02 _ZN2CA11Transaction6commitEv + 186
    11  AppKit                              0x00007fff29bb2305 __65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke + 274
    12  CoreFoundation                      0x00007fff2c5bb9cd __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
    13  CoreFoundation                      0x00007fff2c5bb902 __CFRunLoopDoObservers + 452
    14  CoreFoundation                      0x00007fff2c55d429 __CFRunLoopRun + 1166
    15  CoreFoundation                      0x00007fff2c55cd48 CFRunLoopRunSpecific + 463
    16  HIToolbox                           0x00007fff2b7f3ab5 RunCurrentEventLoopInMode + 293
    17  HIToolbox                           0x00007fff2b7f36f4 ReceiveNextEventCommon + 371
    18  HIToolbox                           0x00007fff2b7f3568 _BlockUntilNextEventMatchingListInModeWithFilter + 64
    19  AppKit                              0x00007fff29aae363 _DPSNextEvent + 997
    20  AppKit                              0x00007fff29aad102 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1362
    21  AppKit                              0x00007fff2a043eae -[NSComboBoxCell filterEvents:] + 2747
    22  AppKit                              0x00007fff2a044d48 -[NSComboBoxCell popUp:] + 558
    23  AppKit                              0x00007fff29da760b -[NSApplication(NSResponder) sendAction:to:from:] + 312
    24  AppKit                              0x00007fff29e128b6 -[NSControl sendAction:to:] + 86
    25  AppKit                              0x00007fff29e127e8 __26-[NSCell _sendActionFrom:]_block_invoke + 136
    26  AppKit                              0x00007fff29e126ea -[NSCell _sendActionFrom:] + 178
    27  AppKit                              0x00007fff29e3f755 -[NSButtonCell _sendActionFrom:] + 97
    28  AppKit                              0x00007fff29e91412 __48-[NSCell trackMouse:inRect:ofView:untilMouseUp:]_block_invoke + 82
    29  AppKit                              0x00007fff29e10b7d -[NSCell trackMouse:inRect:ofView:untilMouseUp:] + 1231
    30  AppKit                              0x00007fff29e3f4a9 -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 698
    31  AppKit                              0x00007fff2a0430bf -[NSComboBoxCell trackMouse:inRect:ofView:untilMouseUp:] + 532
    32  AppKit                              0x00007fff2a04101c -[NSComboBox mouseDown:] + 345
    33  AppKit                              0x00007fff29ce91eb -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] + 5668
    34  AppKit                              0x00007fff29c1d223 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 2319
    35  AppKit                              0x00007fff29c1c6c9 -[NSWindow(NSEventRouting) sendEvent:] + 481
    36  AppKit                              0x00007fff29ab9954 -[NSApplication(NSEvent) sendEvent:] + 336
    37  AppKit                              0x00007fff29aa719d -[NSApplication run] + 755
    38  AppKit                              0x00007fff29a968a3 NSApplicationMain + 780
    39  Ukelele                             0x00000001001f3310 main + 48
    40  libdyld.dylib                       0x00007fff5979eed9 start + 1
    41  ???                                 0x0000000000000003 0x0 + 3