Application: calligrastage (2.9.11)
KDE Platform Version: 4.14.22 (Compiled from sources)
Qt Version: 4.8.7
Operating System: Linux 4.6.7-300.fc24.x86_64 x86_64
Distribution: "Fedora release 24 (Twenty Four)"

-- Information about the crash:
I am using fedora 24. 
rpm -qa |grep calligra 
calligra-l10n-2.9.11-2.fc24.noarch
calligra-words-2.9.11-4.fc24.x86_64
calligra-core-2.9.11-4.fc24.x86_64
calligra-stage-libs-2.9.11-4.fc24.x86_64
calligra-libs-2.9.11-4.fc24.x86_64
calligra-stage-2.9.11-4.fc24.x86_64
calligra-sheets-libs-2.9.11-4.fc24.x86_64
calligra-kdchart-2.9.11-4.fc24.x86_64
calligra-sheets-2.9.11-4.fc24.x86_64
calligra-words-libs-2.9.11-4.fc24.x86_64

It crash every time I open a .ppt file.

The crash can be reproduced every time.

-- Backtrace:
Application: Stage (calligrastage), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[KCrash Handler]
#6  0x00007fcccc215991 in KoXmlWriter::endElement() () at /lib64/libkoodf.so.14
#7  0x00007fcccddb16bd in OdfWriter::end() () at /lib64/libkotext.so.14
#8  0x00007fcccddb15fe in OdfWriter::end() () at /lib64/libkotext.so.14
#9  0x00007fcca3c8dcbc in OdfWriter::OdfWriter(OdfWriter*, char const*, bool) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#10 0x00007fcca3c8bd3d in PptToOdp::processParagraph(Writer&, QStack<PptToOdp::TextListTag>&, MSO::OfficeArtClientData const*, MSO::TextContainer const*, MSO::TextRuler const*, bool, QString const&, int, int) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#11 0x00007fcca3c8c620 in PptToOdp::processTextForBody(Writer&, MSO::OfficeArtClientData const*, MSO::TextContainer const*, MSO::TextRuler const*, bool) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#12 0x00007fcca3c8cb81 in PptToOdp::DrawClient::processClientTextBox(MSO::OfficeArtClientTextBox const&, MSO::OfficeArtClientData const*, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#13 0x00007fcca3d5a1f5 in ODrawToOdf::processText(MSO::OfficeArtSpContainer const&, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#14 0x00007fcca3d5a480 in ODrawToOdf::processTextBox(MSO::OfficeArtSpContainer const&, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#15 0x00007fcca3d5a9e5 in ODrawToOdf::processRectangle(MSO::OfficeArtSpContainer const&, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#16 0x00007fcca3d5dec4 in ODrawToOdf::processDrawingObject(MSO::OfficeArtSpContainer const&, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#17 0x00007fcca3d4bf0f in ODrawToOdf::processGroupShape(MSO::OfficeArtSpgrContainer const&, Writer&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#18 0x00007fcca3c88d5d in PptToOdp::createMainStyles(KoGenStyles&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#19 0x00007fcca3c8a9e9 in PptToOdp::doConversion(KoStore*) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#20 0x00007fcca3c8b3a5 in PptToOdp::convert(QString const&, QString const&, KoStore::Backend) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#21 0x00007fcca3c771fd in PowerPointImport::convert(QByteArray const&, QByteArray const&) () at /usr/lib64/kde4/calligra_filter_ppt2odp.so
#22 0x00007fccce690449 in CalligraFilter::ChainLink::invokeFilter(CalligraFilter::ChainLink const*) () at /lib64/libkomain.so.14
#23 0x00007fccce6885bd in KoFilterChain::invokeChain() () at /lib64/libkomain.so.14
#24 0x00007fccce681e31 in KoFilterManager::importDocument(QString const&, QString const&, KoFilter::ConversionStatus&) () at /lib64/libkomain.so.14
#25 0x00007fccce64b3d1 in KoDocument::openFile() () at /lib64/libkomain.so.14
#26 0x00007fccce65498a in KoDocument::openUrlInternal(KUrl const&) () at /lib64/libkomain.so.14
#27 0x00007fccce654dc8 in KoDocument::openUrl(KUrl const&) () at /lib64/libkomain.so.14
#28 0x00007fccce65f16f in KoMainWindow::openDocumentInternal(KUrl const&, KoPart*, KoDocument*) () at /lib64/libkomain.so.14
#29 0x00007fccce65f721 in KoMainWindow::openDocument(KoPart*, KUrl const&) () at /lib64/libkomain.so.14
#30 0x00007fccce63c410 in KoApplication::start() () at /lib64/libkomain.so.14
#31 0x00007fccce8f567f in kdemain () at /lib64/libkdeinit4_calligrastage.so
#32 0x00007fccc833e731 in __libc_start_main () at /lib64/libc.so.6
#33 0x000055811b209a09 in _start ()

Reported using DrKonqi