$ gdb qocoa.app/Contents/MacOS/qocoa
GNU gdb 6.3.50-20050815 (Apple version gdb-1518) (Sat Feb 12 02:52:12 UTC 2011)
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This GDB was configured as "x86_64-apple-darwin"...Reading symbols for shared libraries ......... done
(gdb) run
Starting program: qocoa.app/Contents/MacOS/qocoa
Reading symbols for shared libraries .++++++++......................................................................................... done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_INVALID_ADDRESS at address: 0x0000000000000000
0x00007fff84c2d960 in CFDictionaryGetValue ()
(gdb) bt
#0 0x00007fff84c2d960 in CFDictionaryGetValue ()
#1 0x00007fff8a5f548a in CUIRenderer::DecodeToCUIInfo ()
#2 0x00007fff8a608a78 in CUIRenderer::Draw ()
#3 0x00007fff81c42e23 in -[NSButtonCell drawWithFrame:inView:] ()
#4 0x00007fff81c3b444 in -[NSControl drawRect:] ()
#5 0x00007fff81c33cc5 in -[NSView _drawRect:clip:] ()
#6 0x00007fff81c32938 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#7 0x00007fff81c32ca2 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#8 0x00007fff81c32ca2 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#9 0x00007fff81c32ca2 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#10 0x00007fff81c32ca2 in -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] ()
#11 0x00007fff81c3100a in -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] ()
#12 0x00007fff81c30b2c in -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] ()
#13 0x00007fff81c2d3de in -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] ()
#14 0x00007fff81ba6c0e in -[NSView displayIfNeeded] ()
#15 0x000000010004549a in -[QCocoaWindow displayIfNeeded] ()
#16 0x00007fff81b6ec3b in -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] ()
#17 0x00007fff81b6e7d2 in -[NSWindow orderWindow:relativeTo:] ()
#18 0x00007fff81b6c154 in -[NSWindow makeKeyAndOrderFront:] ()
#19 0x000000010003958c in QWidgetPrivate::show_sys ()
#20 0x00000001000efc68 in QWidgetPrivate::show_helper ()
#21 0x00000001000eff9f in QWidget::setVisible ()
#22 0x00000001000059ff in QWidget::show (this=0x7fff5fbff810) at qwidget.h:487
#23 0x0000000100005976 in main (argc=1, argv=0x7fff5fbff880) at main.cpp:9