I use a MacBook Pro with a retina display, and switch between my home setup (closed clamshell with 2 external monitors) and office setup (open clamshell with 1 external monitor).  Sometimes when I do that, Qt Creator crashes while responding to Cocoa's screen change notification.  I've attached a sample crash report.  Here's the crash backtrace:

Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000088

0 libqcocoa.dylib 0x000000010dc01530 0x10dbf3000 + 58672
1 libqcocoa.dylib 0x000000010dc0c98b 0x10dbf3000 + 104843
2 org.qt-project.QtCore 0x000000010b5921ff QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const + 1295
3 libqcocoa.dylib 0x000000010dc0fbf0 0x10dbf3000 + 117744

…
13 com.apple.AppKit 0x00007fff4b83f35c -[NSWindow _updateSettingsSendingScreenChangeNotificationIfNeeded:] + 188