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Hi Rui,
I most always run qtractor from the console, especially when troubleshooting.
Anyway, I just re-built it with both --enable-debug and --enable-stacktrace. Here is the console output:

[hines_j@garage qtractor]$ ./qtractor
Warning: no translation found for 'en_US' locale: /usr/share/qt4/translations/qt_en_US.qm
Warning: no translation found for 'en_US' locale: /usr/local/share/locale/qtractor_en_US.qm
*** glibc detected *** ./qtractor: malloc(): memory corruption (fast): 0x08c04e40 ***
======= Backtrace: =========
/lib/libc.so.6[0x8cb8ac]
/lib/libc.so.6(__libc_calloc+0x8a)[0x8cc89a]
/lib/libglib-2.0.so.0(g_malloc0+0x3e)[0xcdea5e]
/lib/libglib-2.0.so.0(g_thread_self+0x6c)[0xcfa69c]
/lib/libglib-2.0.so.0(g_main_context_iteration+0x53)[0xcdab43]
/usr/lib/libQtCore.so.4(_ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE+0x5e)[0x5353e0e]
/usr/lib/libQtCore.so.4(_ZN16QCoreApplication13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEEi+0x61)[0x5329c51]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x835)[0x8067b75]
[0x110400]
/lib/libc.so.6(memmove+0x23)[0x8d2353]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x3d37)[0x806b077]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x40b2)[0x806b3f2]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x4275)[0x806b5b5]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x42e2)[0x806b622]
./qtractor(_ZNK13QWindowsStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget+0x4546)[0x806b886]
/usr/lib/libQtCore.so.4[0x523d7ae]
/lib/libpthread.so.0[0x9f350b]
/lib/libc.so.6(clone+0x5e)[0x934b2e]
======= Memory map: ========
00110000-00111000 r-xp 00110000 00:00 0          [vdso]
00111000-001f1000 r-xp 00000000 08:01 22146825   /usr/lib/libstdc++.so.6.0.8
001f1000-001f5000 r--p 000df000 08:01 22146825   /usr/lib/libstdc++.so.6.0.8
001f5000-001f6000 rw-p 000e3000 08:01 22146825   /usr/lib/libstdc++.so.6.0.8
001f6000-001fc000 rw-p 001f6000 00:00 0
001ff000-00204000 r-xp 00000000 08:01 36110785   /usr/lib/libogg.so.0.5.3
00204000-00205000 rw-p 00004000 08:01 36110785   /usr/lib/libogg.so.0.5.3
00205000-00207000 r-xp 00000000 08:01 22152854   /usr/lib/gconv/UTF-16.so
00207000-00208000 r--p 00001000 08:01 22152854   /usr/lib/gconv/UTF-16.so
00208000-00209000 rw-p 00002000 08:01 22152854   /usr/lib/gconv/UTF-16.so
00209000-0020e000 r-xp 00000000 08:01 24674777   /usr/lib/qt4/plugins/imageformats/libqgif.so
0020e000-0020f000 rw-p 00005000 08:01 24674777   /usr/lib/qt4/plugins/imageformats/libqgif.so
0020f000-00215000 r-xp 00000000 08:01 24674778   /usr/lib/qt4/plugins/imageformats/libqico.so
00215000-00216000 rw-p 00005000 08:01 24674778   /usr/lib/qt4/plugins/imageformats/libqico.so
00216000-0021f000 r-xp 00000000 08:01 24674779   /usr/lib/qt4/plugins/imageformats/libqjpeg.so
0021f000-00220000 rw-p 00008000 08:01 24674779   /usr/lib/qt4/plugins/imageformats/libqjpeg.so
00220000-00225000 r-xp 00000000 08:01 24674780   /usr/lib/qt4/plugins/imageformats/libqmng.so
00225000-00226000 rw-p 00004000 08:01 24674780   /usr/lib/qt4/plugins/imageformats/libqmng.so
00226000-00229000 r-xp 00000000 08:01 24674781   /usr/lib/qt4/plugins/imageformats/libqsvg.so
00229000-0022a000 rw-p 00002000 08:01 24674781   /usr/lib/qt4/plugins/imageformats/libqsvg.so
0022a000-0022e000 r-xp 00000000 08:01 24674782   /usr/lib/qt4/plugins/imageformats/libqtiff.so
0022e000-0022f000 rw-p 00003000 08:01 24674782   /usr/lib/qt4/plugins/imageformats/libqtiff.so
00230000-00274000 r-xp 00000000 08:01 36110915   /usr/lib/libQtXml.so.4.4.3
00274000-00276000 rw-p 00043000 08:01 36110915   /usr/lib/libQtXml.so.4.4.3
00276000-002a8000 r-xp 00000000 08:01 22146810   /usr/lib/liblcms.so.1.0.16
002a8000-002aa000 rw-p 00031000 08:01 22146810   /usr/lib/liblcms.so.1.0.16
002aa000-002ac000 rw-p 002aa000 00:00 0
002ac000-002b6000 r-xp 00000000 08:01 10715244   /lib/libnss_files-2.7.so
002b6000-002b7000 r--p 00009000 08:01 10715244   /lib/libnss_files-2.7.so
002b7000-002b8000 rw-p 0000a000 08:01 10715244   /lib/libnss_files-2.7.so
002ed000-00309000 r-xp 00000000 08:01 36110621   /usr/lib/libsamplerate.so.0.1.1
00309000-0030a000 rw-p 0001b000 08:01 36110621   /usr/lib/libsamplerate.so.0.1.1
0030a000-00356000 r-xp 00000000 08:01 36110695   /usr/lib/libQtSvg.so.4.4.3
00356000-00359000 rw-p 0004b000 08:01 36110695   /usr/lib/libQtSvg.so.4.4.3
00409000-00462000 r-xp 00000000 08:01 22124976   /usr/lib/libsndfile.so.1.0.17
00462000-00463000 rw-p 00059000 08:01 22124976   /usr/lib/libsndfile.so.1.0.17
00463000-00468000 rw-p 00463000 00:00 0
004dd000-004e8000 r-xp 00000000 08:01 36113543   /usr/lib/libvorbisenc.so.2.0.3
004e8000-005d6000 rw-p 0000b000 08:01 36113543   /usr/lib/libvorbisenc.so.2.0.3
0061c000-00639000 r-xp 00000000 08:01 36110786   /usr/lib/libvorbis.so.0.4.0
00639000-00647000 rw-p 0001c000 08:01 36110786   /usr/lib/libvorbis.so.0.4.0
006b1000-006c4000 r-xp 00000000 08:01 22125399   /usr/lib/libjack.so.0.0.28
006c4000-006c6000 rw-p 00013000 08:01 22125399   /usr/lib/libjack.so.0.0.28
006c6000-006ce000 rw-p 006c6000 00:00 0
006d0000-006de000 r-xp 00000000 08:01 22125398   /usr/lib/libcelt.so.0.0.0
006de000-006df000 rw-p 0000d000 08:01 22125398   /usr/lib/libcelt.so.0.0.0
006e1000-006e8000 r-xp 00000000 08:01 36110909   /usr/lib/libvorbisfile.so.3.2.0
006e8000-006e9000 rw-p 00006000 08:01 36110909   /usr/lib/libvorbisfile.so.3.2.0
007e6000-007fc000 r-xp 00000000 08:01 36110834   /usr/lib/libmad.so.0.2.1
007fc000-007fd000 rw-p 00015000 08:01 36110834   /usr/lib/libmad.so.0.2.1
007ff000-00809000 r-xp 00000000 08:01 36113542   /usr/lib/liblo.so.0

Anything useful here?

[EDIT] Something maybe worth mentioning, after qtractor crashes on the export, qjackctl reports RTle+02% on its display, and I have to stop jack and restart it or qtractor can never connect to it again.

Lexridge