Im still having this error with Flatten Image.
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_CRASH (SIGILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Signal: Illegal instruction: 4
Termination Reason: Namespace SIGNAL, Code 0x4
Terminating Process: gimp-2.10 [22877]
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 GIMP 0x0000000102fedaeb gimp_operation_layer_mode_real_process + 1035
1 GIMP 0x0000000102fed6d1 gimp_operation_layer_mode_process + 113
2 libgegl-0.4.0.dylib 0x0000000103d16469 thread_process + 713
3 libgegl-0.4.0.dylib 0x0000000103d15ae2 gegl_operation_point_composer3_process + 1618
4 libgegl-0.4.0.dylib 0x0000000103d15f83 gegl_operation_composer3_process + 339
5 GIMP 0x0000000102fed64b gimp_operation_layer_mode_parent_process + 923
6 libgegl-0.4.0.dylib 0x0000000103d0dc50 gegl_operation_process + 608
7 libgegl-0.4.0.dylib 0x0000000103d27302 gegl_graph_process + 642
8 libgegl-0.4.0.dylib 0x0000000103d263d3 gegl_eval_manager_apply + 627
9 libgegl-0.4.0.dylib 0x0000000103d1db79 gegl_node_blit_buffer + 169
10 GIMP 0x0000000102efa58e gimp_image_merge_layers + 3246
11 GIMP 0x0000000102efabf4 gimp_image_flatten + 804
12 GIMP 0x0000000102a64a66 image_flatten_image_cmd_callback + 118
13 libgobject-2.0.0.dylib 0x00000001040b54d6 g_closure_invoke + 258
14 libgobject-2.0.0.dylib 0x00000001040ca4d7 signal_emit_unlocked_R + 1735
15 libgobject-2.0.0.dylib 0x00000001040cb1ef g_signal_emit_valist + 2039
16 libgobject-2.0.0.dylib 0x00000001040cb8a6 g_signal_emit + 134
17 libgtk-quartz-2.0.0.dylib 0x000000010349b52e _gtk_action_emit_activate + 68
18 libgobject-2.0.0.dylib 0x00000001040b54d6 g_closure_invoke + 258
19 libgobject-2.0.0.dylib 0x00000001040ca2bf signal_emit_unlocked_R + 1199
20 libgobject-2.0.0.dylib 0x00000001040cb1ef g_signal_emit_valist + 2039
21 libgobject-2.0.0.dylib 0x00000001040cb8a6 g_signal_emit + 134
22 libgtk-quartz-2.0.0.dylib 0x0000000103641cd7 gtk_widget_activate + 73
23 libgtk-quartz-2.0.0.dylib 0x00000001035571ea gtk_menu_shell_activate_item + 241
24 libgtk-quartz-2.0.0.dylib 0x0000000103557d94 gtk_menu_shell_button_release + 576
25 libgtk-quartz-2.0.0.dylib 0x00000001035475bf _gtk_marshal_BOOLEAN__BOXED + 95
26 libgobject-2.0.0.dylib 0x00000001040b54d6 g_closure_invoke + 258
27 libgobject-2.0.0.dylib 0x00000001040ca62a signal_emit_unlocked_R + 2074
28 libgobject-2.0.0.dylib 0x00000001040cb24b g_signal_emit_valist + 2131
29 libgobject-2.0.0.dylib 0x00000001040cb8a6 g_signal_emit + 134
30 libgtk-quartz-2.0.0.dylib 0x0000000103641ae5 gtk_widget_event_internal + 573
31 libgtk-quartz-2.0.0.dylib 0x00000001035453f0 gtk_propagate_event + 316
32 libgtk-quartz-2.0.0.dylib 0x0000000103545004 gtk_main_do_event + 784
33 libgdk-quartz-2.0.0.dylib 0x00000001038770fb gdk_event_dispatch + 84
34 libglib-2.0.0.dylib 0x0000000104128df5 g_main_context_dispatch + 266
35 libglib-2.0.0.dylib 0x00000001041290e6 g_main_context_iterate + 418
36 libglib-2.0.0.dylib 0x000000010412933c g_main_loop_run + 207
37 GIMP 0x0000000102a2fc29 app_run + 2169
38 GIMP 0x0000000102a333aa main + 1402
39 libdyld.dylib 0x00007fffe963d235 start + 1