Load a shapefile, open the attribute table, and then click the Close button in the attribute dialog. OS X crashes after getting the SBOD (spinning beachball of death) for a minute or so. Seems to work fine on Linux.
Partial crash log:
Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x000000b8
Thread 0 Crashed:
0 QtGui 0x012618e4 QWidget::testAttribute_helper(Qt::WidgetAttribute) const + 32
1 QtGui 0x01268de0 QWidgetPrivate::close_helper(QWidgetPrivate::CloseMode) + 332
2 QtGui 0x0126d9d4 QWidget::qt_metacall(QMetaObject::Call, int, void**) + 476
3 QtGui 0x014b5098 QDialog::qt_metacall(QMetaObject::Call, int, void**) + 40
4 libqgis_gui.0.dylib 0x03459898 QgsAttributeTableDisplay::qt_metacall(QMetaObject::Call, int, void**) + 40 (qgsattributetabledisplay.moc.cpp:76)
5 QtCore 0x01089d58 QMetaObject::activate(QObject*, int, int, void**) + 1152
6 QtGui 0x014b0634 QAbstractButton::clicked(bool) + 76
7 QtGui 0x013b4228 QAbstractButtonPrivate::click() + 164
8 QtGui 0x013b4450 QAbstractButton::mouseReleaseEvent(QMouseEvent*) + 112
9 QtGui 0x0126af44 QWidget::event(QEvent*) + 752
10 QtGui 0x012375c0 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 384
11 QtGui 0x0123dba0 QApplication::notify(QObject*, QEvent*) + 2064
12 QtGui 0x01275f9c QApplicationPrivate::globalEventProcessor(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 6652
This appears to be resolved with latest SVN and Qt 4.2.1.