musescore trunk hangs when I click on the "Line" tab

Musescore trunk hangs when I click on the "Line" tab.
Here is the gdb log:

(gdb) where
#0 0x0833f64d in TextLine::lineWidth (this=0x0)
at /home/collette/repositories/mscore/mscore/libmscore/textline.h:126
#1 0x086329ac in Text::layout (this=0x95e4868, layoutWidth=25.859375, x=0, y=0)
at /home/collette/repositories/mscore/mscore/libmscore/text.cpp:328
#2 0x08632319 in Text::layout (this=0x95e4868)
at /home/collette/repositories/mscore/mscore/libmscore/text.cpp:274
#3 0x0863b688 in TextLine::layout (this=0x95e45f0)
at /home/collette/repositories/mscore/mscore/libmscore/textline.cpp:535
#4 0x08383989 in Palette::paintEvent (this=0x95c35d8, event=0xbfffb404)
at /home/collette/repositories/mscore/mscore/mscore/palette.cpp:512
#5 0xb58514ba in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#6 0x08384213 in Palette::event (this=0x95c35d8, ev=0xbfffb404)
at /home/collette/repositories/mscore/mscore/mscore/palette.cpp:606
#7 0xb57f5fb4 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#8 0xb57fb044 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#9 0xb4ff5f2e in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#10 0xb584e152 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#11 0xb584eea7 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#12 0xb584dea8 in QWidgetPrivate::drawWidget(QPaintDevice*, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#13 0xb584eea7 in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
#14 0xb584ed6d in QWidgetPrivate::paintSiblingsRecursive(QPaintDevice*, QList const&, int, QRegion const&, QPoint const&, int, QPainter*, QWidgetBackingStore*) () from /usr/lib/libQtGui.so.4
---Type to continue, or q to quit---

I use mageia 1 on a 32 bit system.

Best regards,

YC