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This I get when starting via gdb and bt after the crash is written here (https://linuxmusicians.com/viewtopic.php?t=10437):

qtractorLv2Plugin[0x1a7a920] uri="http://synthv1.sourceforge.net/lv2"
qtractor_lv2_time_position_open(0x1a7a920)
qtractorLv2Plugin[0x1a7a920]::setChannels(2) instances=1
[New Thread 0x7fffb7fff700 (LWP 3423)]

Program received signal SIGSEGV, Segmentation fault.
0x00007fffb75d61fe in ?? () from /usr/lib/libsynthv1.so.0
(gdb) bt
#0 0x00007fffb75d61fe in ?? () from /usr/lib/libsynthv1.so.0
#1 0x00007ffff7dea1da in call_init (l=, argc=argc@entry=1, argv=argv@entry=0x7fffffffdf08, env=env@entry=0x7fffffffdf18) at dl-init.c:78
#2 0x00007ffff7dea2c3 in call_init (env=, argv=, argc=, l=) at dl-init.c:36
#3 _dl_init (main_map=main_map@entry=0x1801670, argc=1, argv=0x7fffffffdf08, env=0x7fffffffdf18) at dl-init.c:126
#4 0x00007ffff7deed00 in dl_open_worker (a=a@entry=0x7fffffffa888) at dl-open.c:577
#5 0x00007ffff7dea094 in _dl_catch_error (objname=objname@entry=0x7fffffffa878, errstring=errstring@entry=0x7fffffffa880, mallocedp=mallocedp@entry=0x7fffffffa870, operate=operate@entry=0x7ffff7deea30

, args=args@entry=0x7fffffffa888) at dl-error.c:187
#6 0x00007ffff7dee44b in _dl_open (file=0xead107 "/usr/lib/lv2/synthv1.lv2/synthv1.so", mode=-2147483646, caller_dlopen=, nsid=-2, argc=1, argv=0x7fffffffdf08, env=0x7fffffffdf18) at dl-open.c:661
#7 0x00007ffff247202b in dlopen_doit (a=a@entry=0x7fffffffaaa0) at dlopen.c:66
#8 0x00007ffff7dea094 in _dl_catch_error (objname=0xa81750, errstring=0xa81758, mallocedp=0xa81748, operate=0x7ffff2471fd0 , args=0x7fffffffaaa0) at dl-error.c:187
#9 0x00007ffff247262d in _dlerror_run (operate=operate@entry=0x7ffff2471fd0 , args=args@entry=0x7fffffffaaa0) at dlerror.c:163
#10 0x00007ffff24720c1 in __dlopen (file=, mode=) at dlopen.c:87
#11 0x00007ffff5d2aeaa in ?? () from /usr/lib/liblilv-0.so.0
#12 0x00007ffff5d2aa50 in lilv_plugin_instantiate () from /usr/lib/liblilv-0.so.0
#13 0x00000000004d2fea in qtractorLv2Plugin::setChannels (this=0x1a7a920, iChannels=2) at qtractorLv2Plugin.cpp:2733
#14 0x00000000004d224f in qtractorLv2Plugin::qtractorLv2Plugin (this=0x1a7a920, pList=0xcf5d70, pLv2Type=0x17ee4f0) at qtractorLv2Plugin.cpp:2525
#15 0x0000000000579a30 in qtractorPluginFactory::createPlugin (pList=0xcf5d70, sFilename=..., iIndex=0, typeHint=qtractorPluginType::Lv2) at qtractorPluginFactory.cpp:476
#16 0x0000000000582fb8 in qtractorPluginListView::addPlugin (this=0x16cbe50) at qtractorPluginListView.cpp:541
#17 0x00000000006f4e81 in qtractorTrackForm::addPlugin (this=0x7fffffffc090) at qtractorTrackForm.cpp:1490
#18 0x0000000000709289 in qtractorTrackForm::qt_static_metacall (_o=0x7fffffffc090, _c=QMetaObject::InvokeMetaMethod, _id=18, _a=0x7fffffffb2f0) at .moc/moc_qtractorTrackForm.cpp:174
#19 0x00007ffff39132a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#20 0x00007ffff4a5ae42 in QAbstractButton::clicked(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#21 0x00007ffff47e4096 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#22 0x00007ffff47e4bae in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#23 0x00007ffff47e4d24 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#24 0x00007ffff48a0a7a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#25 0x00007ffff4728ea5 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#26 0x00007ffff48a0b59 in QToolButton::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#27 0x00007ffff46edc8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#28 0x00007ffff46f3b61 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#29 0x00007ffff38ebc2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007ffff46f19e1 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#31 0x00007ffff4745bbf in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#32 0x00007ffff47479bb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#33 0x00007ffff46edc8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#34 0x00007ffff46f2e56 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#35 0x00007ffff38ebc2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007ffff3e0b25c in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#37 0x00007ffff3e0c925 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#38 0x00007ffff3df5858 in QWindowSystemInterface::sendWindowSystemEvents(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#39 0x00007fffe85ad5b0 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#40 0x00007fffef873e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#41 0x00007fffef874048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#42 0x00007fffef8740ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007ffff393898c in QEventDispatcherGlib::processEvents(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007ffff38ea96b in QEventLoop::exec(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007ffff48d4e0d in QDialog::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#46 0x00000000005e5b2d in qtractorTracks::addTrack (this=0xc63e10) at qtractorTracks.cpp:2565
#47 0x000000000062ecc4 in qtractorMainForm::trackAdd (this=0x7fffffffd620) at qtractorMainForm.cpp:3411
#48 0x0000000000704271 in qtractorMainForm::qt_static_metacall (_o=0x7fffffffd620, _c=QMetaObject::InvokeMetaMethod, _id=29, _a=0x7fffffffc500) at .moc/moc_qtractorMainForm.cpp:832
#49 0x00007ffff39132a6 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007ffff46e6a52 in QAction::triggered(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#51 0x00007ffff46e8f38 in QAction::activate(QAction::ActionEvent) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#52 0x00007ffff47e4bed in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#53 0x00007ffff47e4d24 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#54 0x00007ffff48a0a7a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#55 0x00007ffff4728ea5 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#56 0x00007ffff48a0b59 in QToolButton::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#57 0x00007ffff46edc8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#58 0x00007ffff46f3b61 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#59 0x00007ffff38ebc2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#60 0x00007ffff46f19e1 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#61 0x00007ffff4745bbf in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#62 0x00007ffff47479bb in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#63 0x00007ffff46edc8c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
---Type to continue, or q to quit---
#64 0x00007ffff46f2e56 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#65 0x00007ffff38ebc2d in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#66 0x00007ffff3e0b25c in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#67 0x00007ffff3e0c925 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#68 0x00007ffff3df5858 in QWindowSystemInterface::sendWindowSystemEvents(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
#69 0x00007fffe85ad5b0 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so
#70 0x00007fffef873e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#71 0x00007fffef874048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#72 0x00007fffef8740ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#73 0x00007ffff393898c in QEventDispatcherGlib::processEvents(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#74 0x00007ffff38ea96b in QEventLoop::exec(QFlags) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#75 0x00007ffff38f10e1 in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#76 0x000000000043cc41 in main (argc=1, argv=0x7fffffffdf08) at qtractor.cpp:650
(gdb) Quit