crash when saving antheil.xml

I downloaded the Antheil Jazz Sonata from musescore.com , as *.mscz file. Loading the file in MuseScore 0.9.6.2 on Mac OSX 10.6 works flawlessly, I can play and edit it. But it crashes when I try to save it as *.xml or *.mxl file (I realize it's a horrible thing to convert :) )

From the error log, seems to be something like a null pointer dereference:

Process: mscore [3374]
Path: /Applications/MuseScore.app/Contents/MacOS/mscore
Identifier: net.sourceforge.mscore
Version: 0.9 (0.9.6.2)
Code Type: X86 (Native)
Parent Process: launchd [167]

Date/Time: 2010-09-09 00:27:26.462 +0200
OS Version: Mac OS X 10.6.4 (10F569)
Report Version: 6

Interval Since Last Report: 2690544 sec
Crashes Since Last Report: 7
Per-App Interval Since Last Report: 10802 sec
Per-App Crashes Since Last Report: 2
Anonymous UUID: A343D516-63FE-447C-8F95-21D8ADFEF4FD

Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000004
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 net.sourceforge.mscore 0x0008cf24 findMatchInPart(int, Staff*, bool, Score*, Part*, int, int) + 164
1 net.sourceforge.mscore 0x0008d8b6 DirectionsHandler::buildDirectionsList(Part*, int, int) + 166
2 net.sourceforge.mscore 0x000a3dce ExportMusicXml::write(QIODevice*) + 7342
3 net.sourceforge.mscore 0x000a96d3 Score::saveMxl(QString const&) + 1795
4 net.sourceforge.mscore 0x000bd244 Score::saveAs(bool, QString const&, QString const&) + 2276
5 net.sourceforge.mscore 0x000be7fe Score::saveAs(bool) + 3678
6 net.sourceforge.mscore 0x0016d46b MuseScore::cmd(QAction*) + 2811
7 net.sourceforge.mscore 0x0000c1fe MuseScore::qt_metacall(QMetaObject::Call, int, void**) + 558
8 QtCore 0x031c322a QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 538
9 QtGui 0x0256071e QActionGroup::triggered(QAction*) + 62
10 QtGui 0x02560b23 QActionGroup::checkedAction() const + 83
11 QtGui 0x02560f41 QActionGroup::qt_metacall(QMetaObject::Call, int, void**) + 625
12 QtCore 0x031c322a QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 538
13 QtGui 0x0255c1b4 QAction::triggered(bool) + 68
14 QtGui 0x0255e46f QAction::activate(QAction::ActionEvent) + 159
15 QtGui 0x0253d029 QMenuBar::macUpdateMenuBar() + 5865
16 QtGui 0x0253d689 QMenuBar::macUpdateMenuBar() + 7497
17 com.apple.HIToolbox 0x902cef2f DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1567
18 com.apple.HIToolbox 0x902ce1f6 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411
19 com.apple.HIToolbox 0x902f09bb SendEventToEventTarget + 52
20 com.apple.HIToolbox 0x9031cfa7 SendHICommandEvent(unsigned long, HICommand const*, unsigned long, unsigned long, unsigned char, void const*, OpaqueEventTargetRef*, OpaqueEventTargetRef*, OpaqueEventRef**) + 448
21 com.apple.HIToolbox 0x90341d1c SendMenuCommandWithContextAndModifiers + 66
22 com.apple.HIToolbox 0x90341cd1 SendMenuItemSelectedEvent + 121
23 com.apple.HIToolbox 0x90341bda FinishMenuSelection(SelectionData*, MenuResult*, MenuResult*) + 152
24 com.apple.HIToolbox 0x903112e4 MenuSelectCore(MenuData*, Point, double, unsigned long, OpaqueMenuRef**, unsigned short*) + 454
25 com.apple.HIToolbox 0x904c3911 MenuSelect + 190
26 QtGui 0x024fc59a QApplicationPrivate::globalEventProcessor(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 11898
27 com.apple.HIToolbox 0x902cef2f DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1567
28 com.apple.HIToolbox 0x902ce1f6 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411
29 com.apple.HIToolbox 0x902f09bb SendEventToEventTarget + 52
30 com.apple.HIToolbox 0x9030257b ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 1417
31 com.apple.HIToolbox 0x902cf380 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 2672
32 com.apple.HIToolbox 0x902ce1f6 SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 411
33 com.apple.HIToolbox 0x902f09bb SendEventToEventTarget + 52
34 QtGui 0x02511474 non-virtual thunk to QDesktopWidget::~QDesktopWidget() + 3604
35 QtCore 0x0329b3a1 QEventLoop::processEvents(QFlags) + 65
36 QtCore 0x0329b5cd QEventLoop::exec(QFlags) + 189
37 QtCore 0x0329d92e QCoreApplication::exec() + 174
38 net.sourceforge.mscore 0x00175359 main + 8441
39 net.sourceforge.mscore 0x00007da2 _start + 216
40 net.sourceforge.mscore 0x00007cc9 start + 41