Todays lyx(master-branch) opens documents with the dialog-message

        The cite engine basic has been requested by this document ...

If clocking OK, the file is opened. But if trying to use Document->Settings...
the error-dialog displays again. Click on OK now leads to crash

Anyone there with the same experience?

        Kornel

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(  1) lyx2.3: lyx::frontend::Alert::doError(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)
(  2) lyx2.3: void std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>::__call<void, , 0ul, 1ul, 
2ul>(std::tuple<>&&, std::_Index_tuple<0ul, 1ul, 2ul>)
(  3) lyx2.3: void std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>::operator()<, void>()
(  4) lyx2.3: std::_Function_handler<void (), std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)> >::_M_invoke(std::_Any_data const&)
(  5) lyx2.3: std::function<void ()>::operator()() const
(  6) lyx2.3: lyx::frontend::InGuiThread<void>::synchronousFunctionCall()
(  7) lyx2.3: lyx::frontend::IntoGuiThreadMover::callInGuiThread()
(  8) lyx2.3: void lyx::frontend::InGuiThread<void>::call<std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)> >(std::_Bind<void 
(*(std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const>, 
std::reference_wrapper<bool>))(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)>)
(  9) lyx2.3: void lyx::frontend::InGuiThread<void>::call<void 
(*)(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool), 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const, bool>(void 
(*)(std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool), 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, bool&)
( 10) lyx2.3: lyx::frontend::Alert::error(std::__cxx11::basic_string<wchar_t, 
std::char_traits<wchar_t>, std::allocator<wchar_t> > const&, 
std::__cxx11::basic_string<wchar_t, std::char_traits<wchar_t>, 
std::allocator<wchar_t> > const&, bool)
( 11) lyx2.3: lyx2.3() [0xd9a14e]
( 12) /lib/x86_64-linux-gnu/libc.so.6: 
/lib/x86_64-linux-gnu/libc.so.6(+0x36cb0) [0x7f41b5ddecb0]
( 13) /usr/local/gcc6.1/lib64/libstdc: 
/usr/local/gcc6.1/lib64/libstdc++.so.6(_ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE7compareEPKc+0x10)
 [0x7f41b67af2a0]
( 14) lyx2.3: bool std::operator==<char, std::char_traits<char>, 
std::allocator<char> >(std::__cxx11::basic_string<char, std::char_traits<char>, 
std::allocator<char> > const&, char const*)
( 15) lyx2.3: lyx::frontend::GuiDocument::isBiblatex() const
( 16) lyx2.3: lyx::frontend::GuiDocument::updateEngineDependends()
( 17) lyx2.3: lyx::frontend::GuiDocument::paramsToDialog()
( 18) lyx2.3: 
lyx::frontend::GuiDocument::initialiseParams(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)
( 19) lyx2.3: lyx::frontend::Dialog::showData(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&)
( 20) lyx2.3: lyx::frontend::GuiView::doShowDialog(QString const&, QString 
const&, lyx::Inset*)
( 21) lyx2.3: lyx2.3() [0x1114e34]
( 22) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QMetaObject::activate(QObject*, int, int, void**)
( 23) lyx2.3: lyx::frontend::GuiView::triggerShowDialog(QString const&, QString 
const&, lyx::Inset*)
( 24) lyx2.3: 
lyx::frontend::GuiView::showDialog(std::__cxx11::basic_string<char, 
std::char_traits<char>, std::allocator<char> > const&, 
std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > 
const&, lyx::Inset*)
( 25) lyx2.3: lyx::frontend::GuiView::dispatch(lyx::FuncRequest const&, 
lyx::DispatchResult&)
( 26) lyx2.3: lyx::frontend::GuiApplication::dispatch(lyx::FuncRequest const&, 
lyx::DispatchResult&)
( 27) lyx2.3: lyx::frontend::GuiApplication::dispatch(lyx::FuncRequest const&)
( 28) lyx2.3: lyx::dispatch(lyx::FuncRequest const&)
( 29) lyx2.3: lyx::frontend::Action::action()
( 30) lyx2.3: lyx2.3() [0x11755db]
( 31) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QMetaObject::activate(QObject*, int, int, void**)
( 32) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QAction::triggered(bool)
( 33) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QAction::activate(QAction::ActionEvent)
( 34) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
/usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5(+0x2b5faa) 
[0x7f41b7db5faa]
( 35) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
/usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5(+0x2ba964) 
[0x7f41b7dba964]
( 36) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QMenu::mouseReleaseEvent(QMouseEvent*)
( 37) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QWidget::event(QEvent*)
( 38) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QMenu::event(QEvent*)
( 39) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplicationPrivate::notify_helper(QObject*, QEvent*)
( 40) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplication::notify(QObject*, QEvent*)
( 41) lyx2.3: lyx::frontend::GuiApplication::notify(QObject*, QEvent*)
( 42) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QCoreApplication::notifyInternal2(QObject*, QEvent*)
( 43) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
/usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5(+0x2bde79) 
[0x7f41b7dbde79]
( 44) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QMenu::mouseReleaseEvent(QMouseEvent*)
( 45) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QWidget::event(QEvent*)
( 46) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QMenu::event(QEvent*)
( 47) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplicationPrivate::notify_helper(QObject*, QEvent*)
( 48) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplication::notify(QObject*, QEvent*)
( 49) lyx2.3: lyx::frontend::GuiApplication::notify(QObject*, QEvent*)
( 50) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QCoreApplication::notifyInternal2(QObject*, QEvent*)
( 51) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, 
QWidget**, QPointer<QWidget>&, bool)
( 52) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
/usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5(+0x1b55fb) 
[0x7f41b7cb55fb]
( 53) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
/usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5(+0x1b7513) 
[0x7f41b7cb7513]
( 54) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplicationPrivate::notify_helper(QObject*, QEvent*)
( 55) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Widgets.so.5: 
QApplication::notify(QObject*, QEvent*)
( 56) lyx2.3: lyx::frontend::GuiApplication::notify(QObject*, QEvent*)
( 57) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QCoreApplication::notifyInternal2(QObject*, QEvent*)
( 58) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Gui.so.5: 
QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*)
( 59) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Gui.so.5: 
QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*)
( 60) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Gui.so.5: 
QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>)
( 61) 
/BUILD/BUILDMint17/BuildQt5.7main/5.7/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5:
 
/BUILD/BUILDMint17/BuildQt5.7main/5.7/gcc_64/plugins/platforms/../../lib/libQt5XcbQpa.so.5(+0x9f080)
 [0x7f41b020f080]
( 62) /lib/x86_64-linux-gnu/libglib-2.0.so.0: 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x254) 
[0x7f41b4e18e04]
( 63) /lib/x86_64-linux-gnu/libglib-2.0.so.0: 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x49048) [0x7f41b4e19048]
( 64) /lib/x86_64-linux-gnu/libglib-2.0.so.0: 
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x2c) 
[0x7f41b4e190ec]
( 65) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
( 66) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>)
( 67) /usr/BUILD/BuildQt5/5.7/gcc_64/lib/libQt5Core.so.5: 
QCoreApplication::exec()
( 68) lyx2.3: lyx::frontend::GuiApplication::exec()
( 69) lyx2.3: lyx::LyX::exec(int&, char**)
( 70) lyx2.3: lyx2.3(main+0x5d) [0xea9eda]
( 71) /lib/x86_64-linux-gnu/libc.so.6: 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f41b5dc9f45]
( 72) lyx2.3: lyx2.3() [0xbc3459]

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