I changed the environment setting.  I've included the top (for brevity)
of that backtrace below. It seems to be a null pointer access.

Again, nsfont_open is showing up in both.

Thanks for your help,

   Chris

Stack trace for Zombie Enabled Crash:

#0  0x00007fff8ddf6d57 in ___forwarding___ ()
#1  0x00007fff8ddf6c38 in __forwarding_prep_0___ ()
#2  0x00000001001703d5 in ns_attribute_fvalue ()
#3  0x000000010016e733 in nsfont_open ()
#4  0x0000000100108be0 in font_open_entity ()
#5  0x0000000100108d3c in font_load_for_lface ()
#6  0x0000000100088db5 in realize_face ()
#7  0x0000000100089c65 in lookup_face ()
#8  0x000000010008b6c0 in face_at_buffer_position ()
#9  0x0000000100043178 in handle_face_prop ()
#10 0x0000000100042750 in handle_stop ()
#11 0x0000000100041bc4 in next_element_from_buffer ()
#12 0x0000000100014be0 in get_next_display_element ()
#13 0x000000010002125a in display_line ()
#14 0x0000000100020bd6 in try_window ()
#15 0x000000010003b20d in redisplay_window ()
#16 0x00000001000407b2 in redisplay_window_0 ()
#17 0x00000001000f82e3 in internal_condition_case_1 ()
#18 0x0000000100038119 in redisplay_windows ()
#19 0x000000010001db42 in redisplay_internal ()
#20 0x00000001000204c8 in redisplay_preserve_echo_area ()
#21 0x000000010000621b in Fredisplay ()
#22 0x00000001000f9930 in Ffuncall ()
#23 0x000000010012a305 in exec_byte_code ()
#24 0x00000001000f66ca in eval_sub ()
#25 0x00000001000f8013 in internal_lisp_condition_case ()
#26 0x000000010012af11 in exec_byte_code ()
#27 0x00000001000fa20b in funcall_lambda ()
#28 0x00000001000f97ce in Ffuncall ()
#29 0x00000001000f9d71 in call0 ()
#30 0x00000001000f8193 in internal_condition_case ()
#31 0x0000000100093b06 in safe_run_hook_funcall ()
#32 0x00000001000f9c15 in run_hook_with_args ()
#33 0x0000000100091586 in safe_run_hooks ()
#34 0x00000001000b9903 in run_exit_minibuf_hook ()
#35 0x00000001000f5fc1 in unbind_to ()
#36 0x00000001000b7584 in read_minibuf ()
#37 0x00000001000b6aee in Fread_from_minibuffer ()
#38 0x00000001000f67b9 in eval_sub ()
#39 0x00000001000f6922 in Fprogn ()
#40 0x00000001000fa1d6 in funcall_lambda ()
#41 0x00000001000f97ce in Ffuncall ()
#42 0x000000010012a305 in exec_byte_code ()
#43 0x00000001000fa20b in funcall_lambda ()
#44 0x00000001000f97ce in Ffuncall ()
#45 0x000000010012a305 in exec_byte_code ()
#46 0x00000001000f66ca in eval_sub ()
#47 0x00000001000f7c82 in internal_catch ()
#48 0x000000010012aea8 in exec_byte_code ()
#49 0x00000001000fa20b in funcall_lambda ()
#50 0x00000001000f97ce in Ffuncall ()
#51 0x000000010012a305 in exec_byte_code ()
#52 0x00000001000fa20b in funcall_lambda ()
#53 0x00000001000f97ce in Ffuncall ()
#54 0x000000010012a305 in exec_byte_code ()
#55 0x00000001000fa20b in funcall_lambda ()
#56 0x00000001000f97ce in Ffuncall ()
#57 0x00000001000f521d in Fcall_interactively ()
#58 0x00000001000f9954 in Ffuncall ()
#59 0x00000001000f9dee in call3 ()
#60 0x000000010009061d in command_loop_1 ()
#61 0x00000001000f8193 in internal_condition_case ()
#62 0x000000010009fb15 in command_loop_2 ()
#63 0x00000001000f7c82 in internal_catch ()
#64 0x000000010008f9e5 in recursive_edit_1 ()
#65 0x000000010008fb29 in Frecursive_edit ()
#66 0x000000010008ea80 in main ()

Top of the Stack trace for previous crash:

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: 13 at address: 0x0000000000000000
0x00007fff83fc0210 in objc_msgSend_vtable8 ()

#0  0x00007fff83fc0210 in objc_msgSend_vtable8 ()
#1  0x00000001001703d5 in ns_attribute_fvalue ()
#2  0x000000010016e733 in nsfont_open ()
#3  0x0000000100108be0 in font_open_entity ()
#4  0x0000000100108d3c in font_load_for_lface ()
#5  0x0000000100088db5 in realize_face ()
#6  0x0000000100089c65 in lookup_face ()
#7  0x000000010008b6c0 in face_at_buffer_position ()
#8  0x0000000100043178 in handle_face_prop ()
#9  0x0000000100042750 in handle_stop ()
#10 0x00000001000143cd in start_display ()
#11 0x0000000100020b9d in try_window ()
#12 0x000000010003b20d in redisplay_window ()
#13 0x00000001000407b2 in redisplay_window_0 ()
#14 0x00000001000f82e3 in internal_condition_case_1 ()
#15 0x0000000100038119 in redisplay_windows ()
#16 0x0000000100038120 in redisplay_windows ()
#17 0x0000000100038120 in redisplay_windows ()
#18 0x000000010001db42 in redisplay_internal ()
#19 0x0000000100094795 in read_char ()
#20 0x0000000100091cd0 in read_key_sequence ()
#21 0x0000000100091357 in command_loop_1 ()