LyX se cierra al intentar modificar la configuración (Menú "Documento")

Saludos.

Con un documento recién creado en LyX voy a modificar su configuración (Menú Documento ==> Configuración) y el programa se cierra.

Al lanzarlo desde consola obtengo lo siguiente:

lyx
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Code Preview Pane|P" and "Panel del esquema|P" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Entorno split|s" and "Entorno cases|s" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Fantasma|F" and "Espacio fino|f" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Limpiar página doble|b" and "Optional Line Break|B" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Cita...|C" and "Marco|c" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Configuración...|o" and "Comprimido|o" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Información TeX|X" and "Comprobar TeX|X" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Comentarios PDF|F" and "Diagrama Feynman|F" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Configuración...|o" and "Comprimido|o" share the same shortcut.
support/lassert.cpp (51): ASSERTION static_cast(ascii[i]) < 0x80 VIOLATED IN /home/iurt/rpmbuild/BUILD/lyx-2.3.1/src/support/docstring.cpp:54
( 1) lyx: lyx::doAssertWithCallstack(bool)
( 2) lyx: lyx::doAssert(char const*, char const*, long)
( 3) lyx: lyx::from_ascii(std::__cxx11::basic_string, std::allocator > const&)
( 4) lyx: lyx::frontend::GuiApplication::languageModel()
( 5) lyx: lyx::frontend::GuiDocument::GuiDocument(lyx::frontend::GuiView&)
( 6) lyx: lyx::frontend::createGuiDocument(lyx::frontend::GuiView&)
( 7) lyx: lyx::frontend::GuiView::build(std::__cxx11::basic_string, std::allocator > const&)
( 8) lyx: lyx::frontend::GuiView::findOrBuild(std::__cxx11::basic_string, std::allocator > const&, bool)
( 9) lyx: lyx::frontend::GuiView::doShowDialog(QString const&, QString const&, lyx::Inset*)
( 10) lyx: lyx() [0x10b1228]
( 11) /lib64/libQt5Core.so.5: QMetaObject::activate(QObject*, int, int, void**)
( 12) lyx: lyx::frontend::GuiView::triggerShowDialog(QString const&, QString const&, lyx::Inset*)
( 13) lyx: lyx::frontend::GuiView::showDialog(std::__cxx11::basic_string, std::allocator > const&, std::__cxx11::basic_string, std::allocator > const&, lyx::Inset*)
( 14) lyx: lyx::frontend::GuiView::dispatch(lyx::FuncRequest const&, lyx::DispatchResult&)
( 15) lyx: lyx::frontend::GuiApplication::dispatch(lyx::FuncRequest const&, lyx::DispatchResult&)
( 16) lyx: lyx::frontend::GuiApplication::dispatch(lyx::FuncRequest const&)
( 17) lyx: lyx::dispatch(lyx::FuncRequest const&)
( 18) lyx: lyx::frontend::Action::action()
( 19) lyx: lyx() [0x110f336]
( 20) /lib64/libQt5Core.so.5: QMetaObject::activate(QObject*, int, int, void**)
( 21) /lib64/libQt5Widgets.so.5: QAction::triggered(bool)
( 22) /lib64/libQt5Widgets.so.5: QAction::activate(QAction::ActionEvent)
( 23) /lib64/libQt5Widgets.so.5: /lib64/libQt5Widgets.so.5(+0x2c8b4c) [0x7f1ed7ccfb4c]
( 24) /lib64/libQt5Widgets.so.5: /lib64/libQt5Widgets.so.5(+0x2cfbe0) [0x7f1ed7cd6be0]
( 25) /lib64/libQt5Widgets.so.5: QMenu::mouseReleaseEvent(QMouseEvent*)
( 26) /lib64/libQt5Widgets.so.5: QWidget::event(QEvent*)
( 27) /lib64/libQt5Widgets.so.5: QMenu::event(QEvent*)
( 28) /lib64/libQt5Widgets.so.5: QApplicationPrivate::notify_helper(QObject*, QEvent*)
( 29) /lib64/libQt5Widgets.so.5: QApplication::notify(QObject*, QEvent*)
( 30) lyx: lyx::frontend::GuiApplication::notify(QObject*, QEvent*)
( 31) /lib64/libQt5Core.so.5: QCoreApplication::notifyInternal2(QObject*, QEvent*)
( 32) /lib64/libQt5Widgets.so.5: QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer&, bool, bool)
( 33) /lib64/libQt5Widgets.so.5: /lib64/libQt5Widgets.so.5(+0x1be1bd) [0x7f1ed7bc51bd]
( 34) /lib64/libQt5Widgets.so.5: /lib64/libQt5Widgets.so.5(+0x1c06a8) [0x7f1ed7bc76a8]
( 35) /lib64/libQt5Widgets.so.5: QApplicationPrivate::notify_helper(QObject*, QEvent*)
( 36) /lib64/libQt5Widgets.so.5: QApplication::notify(QObject*, QEvent*)
( 37) lyx: lyx::frontend::GuiApplication::notify(QObject*, QEvent*)
( 38) /lib64/libQt5Core.so.5: QCoreApplication::notifyInternal2(QObject*, QEvent*)
( 39) /lib64/libQt5Gui.so.5: QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
( 40) /lib64/libQt5Gui.so.5: QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
( 41) /lib64/libQt5Gui.so.5: QWindowSystemInterface::sendWindowSystemEvents(QFlags)
( 42) /lib64/libQt5XcbQpa.so.5: /lib64/libQt5XcbQpa.so.5(+0x6f20a) [0x7f1ed385c20a]
( 43) /lib64/libglib-2.0.so.0: /lib64/libglib-2.0.so.0(g_main_context_dispatch+0x135) [0x7f1ed693f665]
( 44) /lib64/libglib-2.0.so.0: /lib64/libglib-2.0.so.0(+0x4d9e8) [0x7f1ed693f9e8]
( 45) /lib64/libglib-2.0.so.0: /lib64/libglib-2.0.so.0(g_main_context_iteration+0x2c) [0x7f1ed693fa6c]
( 46) /lib64/libQt5Core.so.5: QEventDispatcherGlib::processEvents(QFlags)
( 47) /lib64/libQt5Core.so.5: QEventLoop::exec(QFlags)
( 48) /lib64/libQt5Core.so.5: QCoreApplication::exec()
( 49) lyx: lyx::frontend::GuiApplication::exec()
( 50) lyx: lyx::LyX::exec(int&, char**)
( 51) lyx: lyx(main+0x5d) [0xe325b9]
( 52) /lib64/libc.so.6: /lib64/libc.so.6(__libc_start_main+0xeb) [0x7f1ed6a4ab0b]
( 53) lyx: lyx(_start+0x2a) [0xb2e7da]
Assertion triggered in void lyx::doAssertWithCallstack(bool) by failing check "false" in file /home/iurt/rpmbuild/BUILD/lyx-2.3.1/src/support/lassert.cpp:44
Abortado (`core' generado)

¿Alguna sugerencia? ¿Abro bug o es torpeza mía? ¿Problema del LyX o de Mageia 7 (64 bits)?

Gracias,

I027614

Addenda:

Si abro un documento nuevo en blanco, abro la opción "Configuración" del menú Documento y luego procedo a abrir el documento en el que estaba trabajando y a esa misma opción, puedo trabajar sin problemas. En consola aparece:

lyx
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Code Preview Pane|P" and "Panel del esquema|P" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Entorno split|s" and "Entorno cases|s" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Fantasma|F" and "Espacio fino|f" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Limpiar página doble|b" and "Optional Line Break|B" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Cita...|C" and "Marco|c" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Configuración...|o" and "Comprimido|o" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Información TeX|X" and "Comprobar TeX|X" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Comentarios PDF|F" and "Diagrama Feynman|F" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Configuración...|o" and "Comprimido|o" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "PDF (XeTeX)|X" and "Exportar como...|x" share the same shortcut.
frontends/qt4/Menus.cpp (752): Menu warning: menu entries "Configuración...|o" and "Comprimido|o" share the same shortcut.

Gracias.