editor no longer working on MacOSX

[Ben Abbott]

I haven't tried the editor in the GUI for about 3 months. Today when I tried to 
edit a file I encountered an "Abort 6".  From gdb and a backtrace, I see ....

Program received signal SIGABRT, Aborted.
0x00007fff874afce2 in __pthread_kill ()
(gdb) bt
#0  0x00007fff874afce2 in __pthread_kill ()
#1  0x00007fff88c427d2 in pthread_kill ()
#2  0x00007fff88c33a7a in abort ()
#3  0x00007fff88c9284c in free ()
#4  0x00007fff87364702 in std::string::_Rep::_M_dispose ()
#5  0x00007fff873652ba in std::string::assign ()
#6  0x00000001044a0fcd in PropSetSimple::Set ()
#7  0x00000001044e1c1e in ScintillaBase::WndProc ()
#8  0x00000001043b4ab4 in QsciScintilla::setLexer ()
#9  0x0000000100064a66 in file_editor_tab::update_lexer ()
#10 0x000000010006867b in file_editor_tab::notice_settings ()
#11 0x000000010006369c in file_editor_tab::file_editor_tab ()
#12 0x000000010006cdd9 in file_editor::request_open_file ()
#13 0x000000010006d9fe in file_editor::handle_edit_file_request ()
#14 0x00000001000c50ea in file_editor::qt_static_metacall ()
#15 0x0000000104194c14 in QObject::event ()
#16 0x0000000103397441 in QWidget::event ()
#17 0x00000001036bd0a0 in QDockWidget::event ()
#18 0x0000000103347e88 in QApplicationPrivate::notify_helper ()
#19 0x0000000103348106 in QApplication::notify ()
#20 0x00000001041802d2 in QCoreApplication::notifyInternal ()
#21 0x00000001041806e3 in QCoreApplicationPrivate::sendPostedEvents ()
#22 0x00007fff8a5994f1 in 
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ ()
#23 0x00007fff8a598d5d in __CFRunLoopDoSources0 ()
#24 0x00007fff8a5bfb49 in __CFRunLoopRun ()
#25 0x00007fff8a5bf486 in CFRunLoopRunSpecific ()
#26 0x00007fff8614f2bf in RunCurrentEventLoopInMode ()
#27 0x00007fff8615656d in ReceiveNextEventCommon ()
#28 0x00007fff861563fa in BlockUntilNextEventMatchingListInMode ()
#29 0x00007fff8d541779 in _DPSNextEvent ()
#30 0x00007fff8d54107d in -[NSApplication 
nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#31 0x00007fff8d53d9b9 in -[NSApplication run] ()
#32 0x0000000103303a6f in QEventDispatcherMac::processEvents ()
#33 0x000000010417d6f8 in QEventLoop::exec ()
#34 0x0000000104180a23 in QCoreApplication::exec ()
#35 0x000000010008b86f in octave_start_gui ()
#36 0x0000000100009a4f in main ()

Ben