I had a recent crash too with the log indicating SMP was the cause. Log is long gone but here's a section from the OSX crash report - hope this helps.
XP Version: 11.00pb15 (398)
OS Version: Mac OS X 10.12.3
ACF was the LES Saab 340 v1.3
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 mac.xpl 0x000000007ec54fe1 comp(SilverLining::CloudLayer*, SilverLining::CloudLayer*) + 33
1 mac.xpl 0x000000007ec581a5 void std::__final_insertion_sort<__gnu_cxx::__normal_iterator<SilverLining::CloudLayer**, std::vector<SilverLining::CloudLayer*, SilverLiningAllocator<SilverLining::CloudLayer*> > >, bool (*)(SilverLining::CloudLayer*, SilverLining::CloudLayer*)>(__gnu_cxx::__normal_iterator<SilverLining::CloudLayer**, std::vector<SilverLining::CloudLayer*, SilverLiningAllocator<SilverLining::CloudLayer*> > >, __gnu_cxx::__normal_iterator<SilverLining::CloudLayer**, std::vector<SilverLining::CloudLayer*, SilverLiningAllocator<SilverLining::CloudLayer*> > >, bool (*)(SilverLining::CloudLayer*, SilverLining::CloudLayer*)) + 293
2 mac.xpl 0x000000007ec53a41 SilverLining::Atmosphere::DrawObjects(bool, bool, bool, float, bool, void*, bool, bool, bool) + 2337
3 mac.xpl 0x000000007ec1439f silverliningDrawClouds(bool) + 377
4 mac.xpl 0x000000007ec151ce drawCloudsPreAircraft(int, int, void*) + 2220
5 XPLM 0x000000007e09c546 XPLMDispatchDrawingHook(int, int, int) + 158
6 com.laminar-research.X-Plane 0x0000000102c646e4 XPPDoDrawingHook(int) + 132
7 com.laminar-research.X-Plane 0x0000000102c6beb4 OGL_scenery_per_dome_3d_blend(xcam_class*, float, float, float, float, float, float, rendering_pass) + 5796
8 com.laminar-research.X-Plane 0x0000000102c572c3 WORLD_scene_per_render(rendering_pass, float, float, float, float) + 17763
9 com.laminar-research.X-Plane 0x0000000102c59d07 WORLD_scene_per_frame(xplane_window*, int, int) + 3623
10 com.laminar-research.X-Plane 0x0000000103238014 APP_update() + 3124
11 com.laminar-research.X-Plane 0x00000001030459ae MACIBM_post_event_proc() + 318
12 com.laminar-research.X-Plane 0x0000000102e7fc1b WIN_run_app + 43
13 com.laminar-research.X-Plane 0x0000000103264d3d main + 93
14 libdyld.dylib 0x00007fffd6913255 start + 1