To reproduce, open lib/examples/fr/beamer-article.lyx, then right-click on the include inset and go to "edit included file". Then preview with XeTeX.
I can reproduce back to at least 2.2.0. I get the following: support/lassert.cpp (51): ASSERTION d->clone_list_->empty() VIOLATED IN /home/scott/lyxbuilds/master/repo/src/Buffer.cpp:506 ( 1) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: lyx::doAssertWithCallstack(bool) ( 2) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: lyx::doAssert(char const*, char const*, long) ( 3) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: lyx::Buffer::~Buffer() ( 4) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: lyx::Buffer::ExportStatus lyx::frontend::GuiView::GuiViewPrivate::runAndDestroy<std::_Bind<std::_Mem_fn<lyx::Buffer::ExportStatus (lyx::Buffer::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const> (lyx::Buffer*, std::_Placeholder<1>)> >(std::_Bind<std::_Mem_fn<lyx::Buffer::ExportStatus (lyx::Buffer::*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const> (lyx::Buffer*, std::_Placeholder<1>)> const&, lyx::Buffer const*, lyx::Buffer*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ( 5) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: lyx::frontend::GuiView::GuiViewPrivate::previewAndDestroy(lyx::Buffer const*, lyx::Buffer*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ( 6) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: QtConcurrent::StoredFunctorCall3<lyx::Buffer::ExportStatus, lyx::Buffer::ExportStatus (*)(lyx::Buffer const*, lyx::Buffer*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&), lyx::Buffer const*, lyx::Buffer*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::runFunctor() ( 7) /home/scott/lyxbuilds/master/CMakeBuild/bin/lyx: QtConcurrent::RunFunctionTask<lyx::Buffer::ExportStatus>::run() ( 8) /usr/BUILD/BuildQt5-dev/qtbase/lib/libQt5Core.so.5: /usr/BUILD/BuildQt5-dev/qtbase/lib/libQt5Core.so.5(+0xbd586) [0x7f19b25e5586] ( 9) /usr/BUILD/BuildQt5-dev/qtbase/lib/libQt5Core.so.5: /usr/BUILD/BuildQt5-dev/qtbase/lib/libQt5Core.so.5(+0xc45bc) [0x7f19b25ec5bc] ( 10) /lib/x86_64-linux-gnu/libpthread.so.0: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76fa) [0x7f19b0b6f6fa] ( 11) /lib/x86_64-linux-gnu/libc.so.6: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f19b17aab5d] Can anyone else reproduce? Scott
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