This is on Mac, 10.10, LyX-rc1 Is this a known bug; I couldn't find it on trac?
Steps to reproduce: – launch LyX – enter some characters – start new line – switch OS input-method to “Greek Polytonic” – enter some glyphs – at the end of that string, hold down shift and select the Greek – open context-menu, try to select ancient greek for that string ( 1) 1 lyx 0x00000001003deee8 _ZN3lyx8frontend5Alert7doErrorERKSbIwSt11char_traitsIwESaIwEES7_b : 1 lyx 0x00000001003deee8 _ZN3lyx8frontend5Alert7doErrorERKSbIwSt11char_traitsIwESaIwEES7_b + 138 ( 2) 2 lyx 0x00000001003df5fa _ZN3lyx8frontend5Alert5errorERKSbIwSt11char_traitsIwESaIwEES7_b : 2 lyx 0x00000001003df5fa _ZN3lyx8frontend5Alert5errorERKSbIwSt11char_traitsIwESaIwEES7_b + 135 ( 3) 3 lyx 0x0000000100131163 _ZN3lyx21cleanDuplicateEnvVarsEv : 3 lyx 0x0000000100131163 _ZN3lyx21cleanDuplicateEnvVarsEv + 1273 ( 4) 4 libsystem_platform.dylib 0x00007fff94ed1f1a _sigtramp : 4 libsystem_platform.dylib 0x00007fff94ed1f1a _sigtramp + 26 ( 5) 5 CoreFoundation 0x00007fff77bcfed0 __kCFAllocatorSystemDefault : 5 CoreFoundation 0x00007fff77bcfed0 __kCFAllocatorSystemDefault + 0 ( 6) 6 lyx 0x000000010016fcde _ZN3lyx14switchEncodingERSt13basic_ostreamIwSt11char_traitsIwEERKNS_12BufferParamsERKNS_12OutputParamsERKNS_8EncodingEb : 6 lyx 0x000000010016fcde _ZN3lyx14switchEncodingERSt13basic_ostreamIwSt11char_traitsIwEERKNS_12BufferParamsERKNS_12OutputParamsERKNS_8EncodingEb + 651 ( 7) 7 lyx 0x000000010016d2d2 _ZN3lyx9TeXOneParERKNS_6BufferERKNS_4TextElRNS_10otexstreamERKNS_12OutputParamsERKSsii : 7 lyx 0x000000010016d2d2 _ZN3lyx9TeXOneParERKNS_6BufferERKNS_4TextElRNS_10otexstreamERKNS_12OutputParamsERKSsii + 4252 ( 8) 8 lyx 0x00000001001708bf _ZN3lyx15latexParagraphsERKNS_6BufferERKNS_4TextERNS_10otexstreamERKNS_12OutputParamsERKSs : 8 lyx 0x00000001001708bf _ZN3lyx15latexParagraphsERKNS_6BufferERKNS_4TextERNS_10otexstreamERKNS_12OutputParamsERKSs + 1751 ( 9) 9 lyx 0x000000010004436f _ZNK3lyx6Buffer13getSourceCodeERSt13basic_ostreamIwSt11char_traitsIwEERKSsllNS0_10OutputWhatEb : 9 lyx 0x000000010004436f _ZNK3lyx6Buffer13getSourceCodeERSt13basic_ostreamIwSt11char_traitsIwEERKSsllNS0_10OutputWhatEb + 2487 ( 10) 10 lyx 0x00000001005c7ad5 _ZN3lyx8frontend16ViewSourceWidget10getContentEPKNS_10BufferViewENS_6Buffer10OutputWhatERSbIwSt11char_traitsIwESaIwEERKSsb : 10 lyx 0x00000001005c7ad5 _ZN3lyx8frontend16ViewSourceWidget10getContentEPKNS_10BufferViewENS_6Buffer10OutputWhatERSbIwSt11char_traitsIwESaIwEERKSsb + 269 ( 11) 11 lyx 0x00000001005c7f44 _ZN3lyx8frontend16ViewSourceWidget14realUpdateViewEv : 11 lyx 0x00000001005c7f44 _ZN3lyx8frontend16ViewSourceWidget14realUpdateViewEv + 220 ( 12) 12 QtCore 0x00000001014012dd _ZN11QMetaObject8activateEP7QObjectiiPPv : 12 QtCore 0x00000001014012dd _ZN11QMetaObject8activateEP7QObjectiiPPv + 749 ( 13) 13 QtCore 0x00000001013fa390 _ZN7QObject5eventEP6QEvent : 13 QtCore 0x00000001013fa390 _ZN7QObject5eventEP6QEvent + 48 ( 14) 14 QtWidgets 0x0000000101887ae6 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent : 14 QtWidgets 0x0000000101887ae6 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 294 ( 15) 15 QtWidgets 0x000000010188a430 _ZN12QApplication6notifyEP7QObjectP6QEvent : 15 QtWidgets 0x000000010188a430 _ZN12QApplication6notifyEP7QObjectP6QEvent + 5648 ( 16) 16 lyx 0x00000001003f1eb4 _ZN3lyx8frontend14GuiApplication6notifyEP7QObjectP6QEvent : 16 lyx 0x00000001003f1eb4 _ZN3lyx8frontend14GuiApplication6notifyEP7QObjectP6QEvent + 22 ( 17) 17 QtCore 0x00000001013ce114 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent : 17 QtCore 0x00000001013ce114 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 164 ( 18) 18 QtCore 0x0000000101425382 _ZN14QTimerInfoList14activateTimersEv : 18 QtCore 0x0000000101425382 _ZN14QTimerInfoList14activateTimersEv + 1266 ( 19) 19 libqcocoa.dylib 0x0000000103d27772 _ZN28QCocoaEventDispatcherPrivate28activateTimersSourceCallbackEPv : 19 libqcocoa.dylib 0x0000000103d27772 _ZN28QCocoaEventDispatcherPrivate28activateTimersSourceCallbackEPv + 18 ( 20) 20 CoreFoundation 0x00007fff8c1cba01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ : 20 CoreFoundation 0x00007fff8c1cba01 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 ( 21) 21 CoreFoundation 0x00007fff8c1bdb8d __CFRunLoopDoSources0 : 21 CoreFoundation 0x00007fff8c1bdb8d __CFRunLoopDoSources0 + 269 ( 22) 22 CoreFoundation 0x00007fff8c1bd1bf __CFRunLoopRun : 22 CoreFoundation 0x00007fff8c1bd1bf __CFRunLoopRun + 927 ( 23) 23 CoreFoundation 0x00007fff8c1bcbd8 CFRunLoopRunSpecific : 23 CoreFoundation 0x00007fff8c1bcbd8 CFRunLoopRunSpecific + 296 ( 24) 24 HIToolbox 0x00007fff9142f56f RunCurrentEventLoopInMode : 24 HIToolbox 0x00007fff9142f56f RunCurrentEventLoopInMode + 235 ( 25) 25 HIToolbox 0x00007fff9142f2ea ReceiveNextEventCommon : 25 HIToolbox 0x00007fff9142f2ea ReceiveNextEventCommon + 431 ( 26) 26 HIToolbox 0x00007fff9142f12b _BlockUntilNextEventMatchingListInModeWithFilter : 26 HIToolbox 0x00007fff9142f12b _BlockUntilNextEventMatchingListInModeWithFilter + 71 ( 27) 27 AppKit 0x00007fff928b98ab _DPSNextEvent : 27 AppKit 0x00007fff928b98ab _DPSNextEvent + 978 ( 28) 28 AppKit 0x00007fff928b8e58 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] : 28 AppKit 0x00007fff928b8e58 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 346 ( 29) 29 AppKit 0x00007fff928aeaf3 -[NSApplication run] : 29 AppKit 0x00007fff928aeaf3 -[NSApplication run] + 594 ( 30) 30 libqcocoa.dylib 0x0000000103d2837f _ZN21QCocoaEventDispatcher13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE : 30 libqcocoa.dylib 0x0000000103d2837f _ZN21QCocoaEventDispatcher13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 2191 ( 31) 31 QtCore 0x00000001013ca4c1 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE : 31 QtCore 0x00000001013ca4c1 _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 401 ( 32) 32 QtCore 0x00000001013ce785 _ZN16QCoreApplication4execEv : 32 QtCore 0x00000001013ce785 _ZN16QCoreApplication4execEv + 341 ( 33) 33 lyx 0x000000010012b590 _ZN3lyx3LyX4execERiPPc : 33 lyx 0x000000010012b590 _ZN3lyx3LyX4execERiPPc + 946 ( 34) 34 lyx 0x0000000100001bbf main : 34 lyx 0x0000000100001bbf main + 67 ( 35) 35 lyx 0x0000000100001b74 start : 35 lyx 0x0000000100001b74 start + 52