The bug which has confirmed the reproducibility.
For example.
It happened by the procedure as similar.
This occurred when it was making a more complex object.
Unfortunately, this could not be reproduced...
VM Region Summary:
ReadOnly portion of Libraries: Total=318.0M resident=0K(0%) swapped_out_or_unallocated=318.0M(100%)
Writable regions: Total=305.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=305.6M(100%)
Model: Macmini7,1, 2 processors, Intel Core i5, 2.8 GHz, 8 GB,
Graphics: Intel Iris, Intel Iris, Built-In
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz
--------------
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For example.
- Make a Grid object (and an ambient light).
 - Select the Grid and the ambient light by geometrygraph parette. 
 - Apply Ambient occulsion command.
 - Then,Wings3D crashed and opened Apple's error report dialog (I couldn't got wings_crash.dump )
 
Code:
Process:               beam.smp [608]
Path:                  /Applications/Wings3D 2.0.2.app/Contents/Resources/bin/beam.smp
Identifier:            com.wings3d.wings3d
Version:               1.5 (0.1)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           beam.smp [608]
User ID:               501
Date/Time:             2016-01-18 06:35:16.784 +0900
OS Version:            Mac OS X 10.11.2 (15C50)
Report Version:        11
Time Awake Since Boot: 2400 seconds
System Integrity Protection: enabled
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY
VM Regions Near 0:
--> 
    __TEXT                 0000000012d8f000-0000000012fa7000 [ 2144K] r-x/rwx SM=COW  /Applications/Wings3D 2.0.2.app/Contents/Resources/bin/beam.smp
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   GLEngine                          0x00007fff97dca45c gleRunVertexSubmitImmediate + 8300
1   GLEngine                          0x00007fff97d403b4 glDrawArrays_ACC_Exec + 812
2   erl_gl.so                         0x000000001ca49fcc egl_dispatch + 10748
3   wxe_driver.so                     0x000000001510a3b7 gl_dispatch(int, char*, unsigned long, wxe_bin_ref*) + 295
4   wxe_driver.so                     0x000000001510350a WxeApp::dispatch(wxeFifo*) + 250
5   wxe_driver.so                     0x0000000015103070 WxeApp::dispatch_cmds() + 48
6   wxe_driver.so                     0x00000000155f3639 wxEvtHandler::SearchDynamicEventTable(wxEvent&) + 185
7   wxe_driver.so                     0x00000000155f33ab wxEvtHandler::ProcessEventLocally(wxEvent&) + 59
8   wxe_driver.so                     0x00000000155f32be wxEvtHandler::ProcessEvent(wxEvent&) + 190
9   wxe_driver.so                     0x000000001551463d wxAppConsoleBase::ProcessIdle() + 77
10  wxe_driver.so                     0x00000000153c1496 wxAppBase::ProcessIdle() + 22
11  wxe_driver.so                     0x000000001534e2aa wxApp::ProcessIdle() + 26
12  wxe_driver.so                     0x000000001554791c wxEventLoopBase::ProcessIdle() + 28
13  wxe_driver.so                     0x00000000155d1a37 wxCFEventLoop::OSXCommonModeObserverCallBack(__CFRunLoopObserver*, int, void*) + 87
14  com.apple.CoreFoundation          0x00007fff923dde37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
15  com.apple.CoreFoundation          0x00007fff923ddda7 __CFRunLoopDoObservers + 391
16  com.apple.CoreFoundation          0x00007fff923cfa3a __CFRunLoopRun + 1178
17  com.apple.CoreFoundation          0x00007fff923cf338 CFRunLoopRunSpecific + 296
18  com.apple.HIToolbox               0x00007fff9b8a0935 RunCurrentEventLoopInMode + 235
19  com.apple.HIToolbox               0x00007fff9b8a076f ReceiveNextEventCommon + 432
20  com.apple.HIToolbox               0x00007fff9b8a05af _BlockUntilNextEventMatchingListInModeWithFilter + 71
21  com.apple.AppKit                  0x00007fff932290ee _DPSNextEvent + 1067
22  com.apple.AppKit                  0x00007fff935f5943 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454
23  com.apple.AppKit                  0x00007fff9321efc8 -[NSApplication run] + 682
24  wxe_driver.so                     0x000000001539cd7e wxGUIEventLoop::OSXDoRun() + 110
25  wxe_driver.so                     0x00000000155d2354 wxCFEventLoop::DoRun() + 52
26  wxe_driver.so                     0x00000000155477e5 wxEventLoopBase::Run() + 165
27  wxe_driver.so                     0x00000000155143c1 wxAppConsoleBase::MainLoop() + 209
28  wxe_driver.so                     0x000000001534e2fa wxApp::OnRun() + 26
29  wxe_driver.so                     0x000000001557a497 wxEntry(int&, wchar_t**) + 71
30  wxe_driver.so                     0x0000000015101912 wxe_main_loop(void*) + 82
31  beam.smp                          0x0000000012ee34c4 erts_sys_main_thread + 276
32  beam.smp                          0x0000000012dddd58 erl_start + 7352It happened by the procedure as similar.
This occurred when it was making a more complex object.
Unfortunately, this could not be reproduced...
Code:
Process:               beam.smp [499]
Path:                  /Applications/Wings3D 2.0.2.app/Contents/Resources/bin/beam.smp
Identifier:            com.wings3d.wings3d
Version:               1.5 (0.1)
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           beam.smp [499]
User ID:               501
Date/Time:             2016-01-18 06:18:08.928 +0900
OS Version:            Mac OS X 10.11.2 (15C50)
Report Version:        11
Time Awake Since Boot: 1400 seconds
Crashed Thread:        0  Dispatch queue: com.apple.main-thread
Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x000000000003b970
Exception Note:        EXC_CORPSE_NOTIFY
VM Regions Near 0x3b970:
--> 
    __TEXT                 000000001209f000-00000000122b7000 [ 2144K] r-x/rwx SM=COW  /Applications/Wings3D 2.0.2.app/Contents/Resources/bin/beam.smp
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   GLEngine                          0x00007fff97dca45c gleRunVertexSubmitImmediate + 8300
1   GLEngine                          0x00007fff97d403b4 glDrawArrays_ACC_Exec + 812
2   erl_gl.so                         0x000000001bdbbfcc egl_dispatch + 10748
3   wxe_driver.so                     0x000000001448a3b7 gl_dispatch(int, char*, unsigned long, wxe_bin_ref*) + 295
4   wxe_driver.so                     0x000000001448350a WxeApp::dispatch(wxeFifo*) + 250
5   wxe_driver.so                     0x0000000014483070 WxeApp::dispatch_cmds() + 48
6   wxe_driver.so                     0x000000001453c8b2 sendevent(wxEvent*, unsigned long) + 6946
7   wxe_driver.so                     0x0000000014973639 wxEvtHandler::SearchDynamicEventTable(wxEvent&) + 185
8   wxe_driver.so                     0x00000000149733ab wxEvtHandler::ProcessEventLocally(wxEvent&) + 59
9   wxe_driver.so                     0x00000000149732be wxEvtHandler::ProcessEvent(wxEvent&) + 190
10  wxe_driver.so                     0x00000000149736df wxEvtHandler::SafelyProcessEvent(wxEvent&) + 15
11  wxe_driver.so                     0x000000001473b660 wxWidgetCocoaImpl::DoHandleMouseEvent(NSEvent*) + 80
12  wxe_driver.so                     0x0000000014737909 wxWidgetCocoaImpl::mouseEvent(NSEvent*, NSView*, void*) + 169
13  com.apple.AppKit                  0x00007fff933820c9 -[NSTrackingArea mouseMoved:] + 152
14  com.apple.AppKit                  0x00007fff93996525 -[NSWindow _handleMouseMovedEvent:] + 266
15  com.apple.AppKit                  0x00007fff93997715 -[NSWindow _reallySendEvent:isDelayedEvent:] + 2108
16  com.apple.AppKit                  0x00007fff932ef735 -[NSWindow sendEvent:] + 517
17  wxe_driver.so                     0x00000000147266e3 -[wxNSWindow sendEvent:] + 131
18  com.apple.AppKit                  0x00007fff932eb8ec -[NSApplication sendEvent:] + 1167
19  wxe_driver.so                     0x000000001468aa48 -[wxNSApplication sendEvent:] + 136
20  com.apple.AppKit                  0x00007fff9321f03a -[NSApplication run] + 796
21  wxe_driver.so                     0x000000001471cd7e wxGUIEventLoop::OSXDoRun() + 110
22  wxe_driver.so                     0x0000000014952354 wxCFEventLoop::DoRun() + 52
23  wxe_driver.so                     0x00000000148c77e5 wxEventLoopBase::Run() + 165
24  wxe_driver.so                     0x00000000148943c1 wxAppConsoleBase::MainLoop() + 209
25  wxe_driver.so                     0x00000000146ce2fa wxApp::OnRun() + 26
26  wxe_driver.so                     0x00000000148fa497 wxEntry(int&, wchar_t**) + 71
27  wxe_driver.so                     0x0000000014481912 wxe_main_loop(void*) + 82
28  beam.smp                          0x00000000121f34c4 erts_sys_main_thread + 276
29  beam.smp                          0x00000000120edd58 erl_start + 7352VM Region Summary:
ReadOnly portion of Libraries: Total=318.0M resident=0K(0%) swapped_out_or_unallocated=318.0M(100%)
Writable regions: Total=305.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=305.6M(100%)
Code:
VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Accelerate.framework               256K        3 
Activity Tracing                  2048K        2 
CG backing stores                 8888K        9 
CG image                          1156K       49 
CG shared images                   432K       14 
CoreAnimation                      448K       91 
CoreUI image data                 2604K       35 
CoreUI image file                  544K       10 
Dispatch continuations            8192K        2 
Foundation                          32K        3 
Image IO                             4K        2 
Kernel Alloc Once                    8K        3 
MALLOC                           145.8M       99 
MALLOC guard page                   32K        7 
MALLOC_LARGE (reserved)            528K        5         reserved VM address space (unallocated)
Memory Tag 242                      12K        2 
OpenCL                              68K       10 
OpenGL GLSL                        256K        4 
Process Corpse Info               2048K        2 
STACK GUARD                       56.1M       26 
Stack                             23.3M       32 
VM_ALLOCATE                       94.4M       68 
__DATA                            31.2M      295 
__GLSLBUILTINS                    2588K        2 
__IMAGE                            528K        2 
__LINKEDIT                        97.4M       19 
__TEXT                           220.7M      302 
__UNICODE                          552K        2 
mapped file                      124.5M       58 
shared memory                     16.4M       12 
===========                     =======  ======= 
TOTAL                            840.3M     1140 
TOTAL, minus reserved VM space   839.8M     1140Model: Macmini7,1, 2 processors, Intel Core i5, 2.8 GHz, 8 GB,
Graphics: Intel Iris, Intel Iris, Built-In
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz
--------------
tkbd