MuseScore crash when clicking the Open file button in ABC Import

On Linux Mint 17, in the lastest MuseScore 2.0 build (3d19d74), MuseScore crash when we click the button "Open file". It produces a Segmentation fault.

(process:6569): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed

My MS was built with Qt 5.3.1 (GCC 4.6.1, 64 bit)

I tried to modify the plugin to open a ColorDialog or a FontDialog instead of a FileDialog and in those cases, everything works.

I also built the Qt Quick System Dialog Examples and all dialogs (including FileDialog) work perfectly.

The problem seems linked with MuseScore style configuration. Here the debug backtrace :
0 QScopedPointer >::operator-> qscopedpointer.h 120 0x950712
1 QObject::parent qobject.h 425 0xb51bae
2 QWidget::parentWidget qwidget.h 851 0xd5a47c
3 MgStyle::drawToolButtonComplexControl mstyle.cpp 4189 0xe2b111
4 MgStyle::drawComplexControl mstyle.cpp 3675 0xe27e80
5 ?? /home/steph/Qt/5.3/gcc_64/lib/libQt5Widgets.so.5 0x7ffff5398285
6 ?? /home/steph/Qt/5.3/gcc_64/qml/QtQuick/Controls/libqtquickcontrolsplugin.so 0x7fffc3d57375
7 ?? /home/steph/Qt/5.3/gcc_64/qml/QtQuick/Controls/libqtquickcontrolsplugin.so 0x7fffc3d5820d
8 QQuickWindowPrivate::polishItems() /home/steph/Qt/5.3/gcc_64/lib/libQt5Quick.so.5 0x7ffff1555882
9 ?? /home/steph/Qt/5.3/gcc_64/lib/libQt5Quick.so.5 0x7ffff1531ac2
10 ?? /home/steph/Qt/5.3/gcc_64/lib/libQt5Quick.so.5 0x7ffff1532c5e
11 QWindow::event(QEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Gui.so.5 0x7ffff6910e19
12 QQuickWindow::event(QEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Quick.so.5 0x7ffff155ee4b
13 QApplicationPrivate::notify_helper(QObject*, QEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Widgets.so.5 0x7ffff52f1a94
14 QApplication::notify(QObject*, QEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Widgets.so.5 0x7ffff52f50b6
15 QCoreApplication::notifyInternal(QObject*, QEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Core.so.5 0x7ffff7214f04
16 QGuiApplicationPrivate::processExposeEvent(QWindowSystemInterfacePrivate::ExposeEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Gui.so.5 0x7ffff6905177
17 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) /home/steph/Qt/5.3/gcc_64/lib/libQt5Gui.so.5 0x7ffff690bfe5
18 QWindowSystemInterface::sendWindowSystemEvents(QFlags) /home/steph/Qt/5.3/gcc_64/lib/libQt5Gui.so.5 0x7ffff68f1208
19 ?? /home/steph/Qt/5.3/gcc_64/plugins/platforms/libqxcb.so 0x7fffe67e6460
20 g_main_context_dispatch /lib/x86_64-linux-gnu/libglib-2.0.so.0 0x7fffeeb2ae04
...

The error seems to come from a null pointer associated with the parent of the FileDialog
const QRect animatedRect( animations().toolBarEngine().animatedRect( widget->parentWidget() ) );

Any other Linux user to confirm this bug? Hard to know if it's MuseScore, Qt or Linux related.